Intimidated by LS wiring? Where I connected loose wires for my OBS Chevy Cheyenne Cammed 5.3 LS swap
HTML-код
- Опубликовано: 2 окт 2024
- When swapping an LS engine (4.8, 5.3, 6.0, ls1, ls2, ls3, ls6, ls7, ls9) into a 1988-1998 Chevy Truck, the donor vehicle wiring harness must be modified to work with the swapped vehicle or a new harness must be made. This video shows where I connected those wires needed to not only make the engine run, but for all your gauges to work as well on a 1995 Chevy Cheyenne. This worked for me with my particular combination. Don't cut ANYTHING until you have the truck running and everything working!
PLEASE NOTE, THIS IS HOW I MADE THESE CONNECTIONS ON MY '95 CHEVY TRUCK 4.3 V6/auto, WITH AN '01 TAHOE ENG/TRANS. THIS IS NOT MEANT TO BE A "HOW TO" ON EVERY OBS OR '88-'98 TRUCK SWAP. THERE ARE LITERALLY HUNDREDS (IF NOT MORE) COMBINATIONS OF YEARS OF TRUCK AND OF ENGINE AND TRANSMISSIONS THAT CAN BE MADE. Over the years GM made changes to each truck and it's combination of drive train (some small and some not so small) . You are embarking on a BIG project, do your research, find wiring schematics for your truck and donor vehicle to guide you through the process. There are many "experts" or "wanna be experts" out there. BE SAFE, HAVE FUN! AND DO YOUR HOMEWORK FIRST. Although this is how I did it, there is more than one way to wire your project. Hopefully you can use this video as a tool to help guide you in the right direction. But, as I said, it is but one direction.
WE GOT SOME LAURENCEVILLE GARAGE SWAG AND DECALS!!
Check it out with this link....
saydesignsllc....
You can use the link below to find PARTS and TOOLS used on this project that can be found on Amazon. We appreciate your support of the channel. Any items purchased through the provided links provides a small commission to the channel. Thank you and good luck with your project!
www.amazon.com...
Check us out on Facebook at laurencevillegarage
As mentioned in the video, a couple of excellent resources for information on this type of swap is:
LS1truck.com and LT1swap.com
Thank you to all my viewers I appreciate the support. Don’t forget to comment / like / share and subscribe it helps me and the channel grow so I can bring more content to you guys.
Thank you for watching this video on the Laurenceville Garage channel, if you would like to help support this channel you can do so through the following links. Thank you!
Donate - CahApp- @$Laurencevillegarage
Paypal - paypal.me/LaurencevilleGarage
Venmo - LaurencevilleGarage
Zelle - laurencevillegarage@yahoo.com
This truck has had a full suspension rebuild along with lowering, rear disc brake conversion and the 5.3 swap. Like and follow my build on facebook at: / ls-swapped-1988-to-199...
OR just search @laurencevillegarage on facebook site
This video and commentary were PERFECT all around. I have a 1995 OBS an everything you explained worked to the T. All gauges are working and I am on the road in less than 15 days start to finish. I especially liked the TCC wire hook-up to the ABS. I was able to do everything with the information you provided. Great job and thank you
Thank you, glad to hear you got it running so quickly. Have fun! Mine puts a smile on my face every time I start her up!
Did u use the 1995 4l60e? I heard there's a way to do it but cant find anything about it online. Was thinking I might need a newer 4l60e because the 1995 4l60e was obd1 and I have a 2002 5.3 I'm putting in.
@@laurencevillegarage @@ amigo, on a 93 obs, swap, there’s a small module near master cylinder,, Has a purple wire on it, it cuts off when brake applyed,, Should i cutt it to hook tcc?? Or should i splice tcc wire into it????
@@gerardolopez5875 splice don’t cut.
@@laurencevillegarage @ thanks,,, nice truck,,,, Are building a 92???
Awesome video, finally someone that knows how to explain something in detail and not just a bunch of random information.
...you sir are a gentleman and a scholar and a God's gift to GMT400 LS swap community. This just made my life so much easier. Pulling the motor out today on my 88 2500 2WD and putting in a 2006 L33 and this is just want I needed.
Thank you, I'm glad it was helpful. Good luck with your swap!
@@laurencevillegarage thank you for your videos. They are very informative. I’m researching right now. I’ve got an 89 k1500. One thing I can’t get a clear picture for, 1.) the original pcm/ecm behind the glove box, does it stay or go? 2.) I thought the LS harness has to connect to the obs harness behind the glove box? Any information is greatly appreciated.
@@OldSoul85 for the most part it goes. The LS harness doesn’t really connect to it as much as connecting a number of loose wires from your LS pcm. The only one needed to actually run the engine are red for constant power, pink for “key on” power and grey for your fuel pump. The remaining wires are for gauges and a/c. It all depends on which features your truck has and what you want to function. For example, your truck probably has a/c, but, you may choose to not have a/c or to use cruise or maybe (like my 91) you don’t have a tach gauge. To make your life easier, as you remove or disconnect your present wiring, label everything you take off and don’t cut anything you don’t absolutely have to laying everything to the side. In my case I taped everything to the windshield to get out of the way. This way when you start to connect all the LS stuff you can find it better. Once everything works that you want THEN you can thin out all the wires you find you do not need. At that point, if all wires have been pulled from the “old” pcm, then just remove it. I find it just make my life more complicated if I start cutting stuff off first. You might cut something you need for later and tracking it down is now more complicated. Keep it as easy as possible. I also recommend getting a GM factory electrical wiring manual for your year truck. I get mine off eBay. They are an excellent investment and extremely detailed. A great resource to help you when few others can. Chilton and Haynes manuals are not much help on wiring. Remember, you are creating something that the “average” mechanic will be clueless about. Keep notes and part numbers as you go, this will be a big help a year from now if something doesn’t work and you have to troubleshoot the issue. You are the only one who will know exactly how you put it together. That’s why I only remove what has to be. You don’t want to end up with a hack job.
@@laurencevillegarage thank you so much for responding. You cleared up alot of questions.
I'm a transmission builder. The switch on the side of the transmission is also known as a PRNDL switch you can either use a heat gun to soften the glue or you can hang an incandescent bulb in a drop light on the plug area for 20 to 30 minutes. To reinstall the plugs I use a cheap cigarette lighter to heat the glue on the plugs moving the flame around the glue until it starts to bubble. Install the plugs while the glue is hot and it will plug in with no issues.
Good to know, I'll try this next time. Thanks for sharing.
Gosh, the information in the video is spot on. Very good job explaining in good detail.
I've searched all over for this kind of video, thank you sir for taking your time to upload this, I very well so appreciate this information that you have put together for us
You're very welcome! Glad you found it helpful!
very helpful.. im in the middle of doing a 5.3 4l60e swap on a 89 c2500 that had a 4.3 and 5 speed manual.. just starting on the wiring.. ordered a stand alone engine and trans harness. this was very helpful, or will be when i wire it up for the original gauges..
yeah.. i broke, on purpose the neutral safety switch.. laying on my back on the floor after 30 minutes trying to get it off, just got mad and yanked on it and it snapped.. luckily it was cheap to replace..
I did the same thing! Special adhesive put on st factory to keep moisture out. I read I’d heated with a heat gun will soften it and it’ll come off easier. I was too impatient! Good luck!
vdub4201, sorry to go off topic with my questions, but I have an '88 c1500 with the 4.3L and the 5 speed manual trans. I see that your project vehicle is a c2500 3/4 ton pickup. Did you have any issues with the truck being underpowered as a 3/4 ton truck? I am contemplating doing an LS swap, but also beefing up my suspension with parts from a c2500 donor truck, including the heftier rear axle. My purpose is to have an all-around hauler around town, for the landscaping projects I am involved with, with an occasional longer highway trip as needed. I'll stick with the v6 (no issues at the moment) until I can find a good used LS to swap into it. To Lawrenceville Garage, thank you for sharing such a detailed video on your LS swap. This is what I sorely need to fill the gap in my knowledge of wiring, especially in doing for my first time an engine swap.
@@tedtolentino4955 when i got the truck the previous owner stole all the stuff of the front of the engine, and it had been sitting for years so i had no interest in fixing that engine.. i paid 700 for a running 03 suburban, the parts to complete the 4,3 would cost mor than i paid for the whole suburban soo.. sold the 4.3 and 5 speed for half what i paid for the truck, then parted out the rest of the suburban for almost what i paid for it..
Great info. I did a lq9 408 into my 96 4x4 Tahoe and did something very similar to your setup. I used the schematics to trace and remove all my old unnecessary wires. I then integrated the ls ecu to my old wiring for the dash info. One thing I did different is screw the obs temp sensor into the passenger head so I didn’t need to tap into any of the wiring. The passenger head send temp to dash and the driver head sends the temp the the ls ecu.
You are correct and I like that idea. That is what I plan to do on the '01 project I'm about to start. Thanks for sharing!
Thanks bro exactly what I needed. Need more people like you thank you. Houston TX
I have been thinking about doing an ls swap on my 1990 Sierra, but the wiring even with your great video is difficult, I will probably put a 350 when I replace the 305. Thank you for the video.
Either way you will enjoy the upgrade. I know the wiring is intimidating. But, after you do one, it really isn’t as bad as you might think. Just work it 1 wire at a time and you can do it. Either way you go, have fun with it, don’t let it stress you out!
@@laurencevillegarage thank you for the quick reply, I subscribed to your channel, great info.
@@Zelaznogsiul-63 Thank you!
Awesome job on your swap and awesome job on this video thankyou very much
Beautiful Truck! Thank you for the detailed video.Btw, Laurenceville GA? Take care from new sub.
Thank you!, Not in GA, in Rockwall Tx
Great video and beautiful truck!! You did a great job and you explained everything very well!!
it would be great if you make more videos with
Good info. Good stuff to know as I will be LS Swapping my 1990 c1500 very soon.
Your video was amazing. It was just what I needed. Thank you very much. I was beginning to get a little overwhelmed
@@tomhayes6920 thank you!
@@laurencevillegarage the grey wire under the fuel relay. Do you remember what one to hook it to?
Excellent video. I wish there were videos and information like this way back when I did my swap. I'm basically to the point of having to re-wire the entire truck. Greetings from across the DFW metroplex. (I'm west of Fort Worth).
Thanks, its a work in progress. Got family over near Azle, small world!
Great info
Very very informative, just what i was looking to find, great job!!! Al tho im not doing an ls swap this helps with my microsquirt setup! Thanks
Ur a legend
Excellent information. Thank you
Great video but looked through all the comments & didn’t see how you got the pnp to work. Mine starts in any gear & reverse lights won’t work. Do you need the shift indicator working to make this happen? & for those of you with the 4x4 what I did to get the transmission to work was hooked up the hi & low vss wires from the new pcm to the hi & low wires for the vss coming from the DRAC (same color wires)& the green pin 50 wire to green speedo wire from the DRAC. Then i jumped my wires from the output vss on the trans to the transfer case vss & all good. Haven’t hooked up the 4wd yet but I believe hooking pin 16 from the new pcm to the low vss wire from the DRAC as well should do it.
My truck is 2wd and was a 4L60e and the Tahoe trans was the same. With that said, there is a shift module mounted on the driver side of the trans. It had 2 plugs: upper plug with ~7 wires and a lower one with 4. The lower connection (or 4 wires) is for the shift indicator lights on the dash. On my truck, I spliced the original 4 wires into the 4 on the plug that was on the Tahoe harness. This allowed all my dash lights for the PRNDL2L1 to illuminate and function correctly.
How much do you charge to do my 96 gmc sierra from 5.7 to a 4.8 vortec from a 2002 chevy silverado
At this time, I don’t work on other peoples vehicles for liability reasons. I may change this in the future…I’m building a new shop, I may start taking in work after completion later this year. Thank you!
Are you located nearby san antonio tx how close are you from here sir
@@alfredoespinoza94 Rockwall is east of Dallas. It’s a ways off.
Real helpfully 👏👏👏
Greatest looking truck ever made
After watching this my obs decided she finally wanted to run thanks man
Damn swap looks clean and factory looking👌
Great job on the truck and video.
Thank you, positive words are always appreciated. I am looking for a new project truck (already have the donor!), when I find the truck I want to use, I'll post up videos from the very beginning. Thanks again.
@@laurencevillegarage you're welcome. I subscribed so i can catch the next video. I just started doing some upgrades on my 1992 one ton truck. Nothing like what you've done but upgrades none the less. I already have the 5.7L and just opened up the exhaust yesterday. Working on the before and after video now.
Thx for the vid really good info in there. Just did a ls3 swap on my 1970 impala best decision ever.
For the vss I just cut the purple and green wires from the old tbi harness and splice them to the purple and green wires coming from the pcm? So then the plug is connected to the ls pcm
I basically did the same thing, just spliced them in at the plug.
ACDelco D1818A for a oil pressure sensor that will screw into the LS valley cover and read with the stock gauge.
Good to know, thank you.
Great video. Who did you go through to get the wiring harness? Doesnt seem nearly as scary with how you explained it.
Dpimg this swap on my 96 w/t 4.3 soon. Appreciate the info. New sub
I used Chris at easyefisolution.com to rewire my harness. He did a great job and I provided a lot of info to make sure it would run well. Of course, in the truck with a laptop or on a dyno would be optimal, but for a basic tune, I cannot complain. I was very intimidated as well. When I got the harness back, looked it over, then installed it on the motor, I was not quite as intimidated. I plan to do my own harness on the "shop truck" project I am starting.
@@laurencevillegarage appreciate it, thanks man
Perfect video THANK YOU sir. I’m doing my ls swap soon and to know what all of these wires do and where to go with them is so helpful!!!
kyle blume Thank you sir, good luck with your project.
This is by far the most detailed gmt400 swap video for wiring!!!
Great video
Helluva video great job great detail
Thank you, hope you found it helpful! Good luck on your project.
Love the video
Start my swap now same truck 88
With a 2001 5.3 💪🏾💪🏾💪🏾💪🏾💪🏾very helpful
Might hit you up on some more stuff with the truck when i started got my harness off ebay
What harness u go with
Psi harness
I sent mine off to Chris at easyefisolutions.com, he modified the harness and tuned (initially) my pcm.
Man this video is so informative!! I have saved this video to reference later! Thank you for taking the time to make and post this!!
You’re welcome, good luck with your project!
I have a 97 I recently swapped a 5.3 in. I'm having troubles wiring the stock 97 bulkhead to the stock 97 fuse block as well as the ls harness to my 97 fuseblock. Can you help?
You can email me or use messenger on facebook and I will do what I can.
Subscribed and will follow. Great video!
Welcome aboard! Thanks for subbing!
I would just like to say thanks for making such a good video. Helped me lots! I'm doing a Similar swap on my 95. I am also running the cruise module from my 2001 parts truck. When you wired it up did you cut the light blue wire from the old computer and wire it directly to the new computer to make it work? That's the only wire I can tell I should need. Just figured I'd ask because yours works. Thanks!
Thank you Mark, I'm glad you found the video helpful. As for the wire, no, I did not. I attached the 3 main wires from the 5.3 harness to make it run. You still need the '95 pcm to do other stuff. One by one I connected all the remaining wires in the modified Tahoe harness. The only wires I eliminated from the original '95 harness were those that were specific to the V6 that would not be needed. When all my lights, gauges and cruise were working, I thinned back the unused wires farther back in the '95 harness. I did not remove any pins from the '95 pcm or modify any '95 wiring inside the cab. Hope that helps.
Hello great and informational video. I'm having trouble finding videos on the wiring of the speedo and tach with a stand alone harness. I looked at the autozone site and didn't see any schematics for instrument cluster, any ideas?? thanks
I apologize for the delay in my response. A factory GM electrical manual for your year truck is very affordable on Ebay and is extremely helpful. For the speedometer, I spliced the vss OBS wires with the vss wires from the LS engine harness and that worked for me. Depending on your year, it may or may not. The tach was easy. On the OBS harness, there is a plug that attaches to the coil that has a white wire within the harness that is not used that is very close to the coil. I used that for the tach signal.
Did you modify any of the factory a.c wiring or you just plugged everything back in place after the ls swap?
I was able to plug everything back in. However, when going that route, any of the LS pcm a/c functions are not going to work because the signal did not go through the pcm.
I have the same truck as your's .My swap is almost done I only have 3/4" play on my slip yoke on my drive shaft was your's that way
'""'''''
Mine had a bit more than that. Since I used sliding motor mounts, I mounted my transmission in the stock original location and then fixed the motor location based on that.
I have a 1989 k1500 that I'm doing a 5.3 swap in. I'm wondering if you took the old computer out completely. Or was it needed?
I left it in and just thinned out some of the unused wiring. I still want everything on the truck to work as original. And, it does. Be sure to not cut or remove anything (if possible) until you have your vehicle running. Then you can thin stuff out. If something stops working you have a better idea what and where to look for the problem. If you delete too much in the beginning, then have issues, it will be much more difficult to track down the issue. Don't remove any grounds, I found that out the hard way.
Did you change anything on the engine harness? Or was it just the 7 wires that needed to be connected to complete this swap?
Yes, the harness is modified. All emissions removed, rear O2 sensors removed. It will all depend on what engine you start with and the vehicles purpose. Depending on your state, you may need to keep some items to remain in compliance with state laws. About half of the original wiring was thinned out.
What company mated your old wiring harness with the new 5.3 wiring harness?
I had easyefisolutions.com to modify my "old" harness. When it comes to integrating the "loose" LS wires into the trucks harness, that is where "you" come in. It will be a bit different on each truck or car. You need a wiring schematic for your vehicle to make things a lot easier.
Good video. It be nice to see what your saying but u did a good job explaining it
I would have liked to, but there was much trial and error. If I showed too much, it would have been boring, not showing enough folks wonder what was edited out. Next build, I will do a lot more detail and include more information. Thank you for the kind words and comments.
very informative, thank you
What color is the wire on fuel pump relay that the grey wire from the Ls pcm that needs to be connected?
Depends on your truck or swap vehicle. I would trace the power wire from your fuel pump (gotta upgrade anyway) forward and tie that in directly where you have good access. On my '91, it was a grey wire... But, there are also several grey wires underhood.
Did you cut the tcc wire from the pcm or did you leave it and just splice a wire to it. Please answer asap
On the blue '95, I attached the TCC wire to the purple wire coming from the abs box. IF you have an ABS box, double check power to that wire with a probe. It needs to have power without touching the brakes and no power when applying the brakes. There are other places you could splice into as well for the same result. That was convenient for me and worked.
you are too smart! I wish you were my cool, beer drinking neoighbor
Thank you for the kind words…love my root beer!
Thank you
Swapping a 95 z71 couldn't do it without your help thanks and God bless keep up the good work and video's
Thank you, and good luck with your Z71!
Did you use your 95 4L60e trans in your swap? Thanks
@@shawnmalicek1189 no I used the 05 4l60e out of my donor truck
@@shawnmalicek1189 No, I used the 4l60e that was from the same donor vehicle as the engine.
@@laurencevillegarage okay thanks
Nice video, bro. Thanks I like it. Listen,I did my 93 Chevy C3500 with 4L80E and 5.7 I swap for a 6.0 and I did the Harness by my self. Ca you told me how to connect the OBDII port. Please
I would have to see your specific wiring harness diagram for the truck AND for the year of engine/harness....but, on mine, the '95 truck harness data link wires show to be tan and white/black...for your engine, it will depend on year and whether it is DBW or DBC and what year it is. I am going to guess it's a gen3 motor... if it is DBW look for a blue/white wire pin 15 and orange/black pin 14 on the blue C1 connector...if DBC look for #58 pin dark green wire. Hope that can give you some direction.
Thanks so much.
Mine it’s Gen 3 ,2003 drive by wire
So do you keep the the obs computer hooked up? Or does it not use anything off that anymore ?
I always suggest in a swap not to cut or remove any wiring untill you get the engine running and everything else working like you want. THEN strip out the unused wiring. Depending on your particular swap (everyone's is a bit different as well as it's intended use), there may be functions you want to retain. It's easier to strip out unused wiring at the end than to remove wires up front than later wonder why something may not work and try to figure it out. Since the wiring is usually the most intimidating part of the swap, save it for last and try to make it as simple as possible. I've had people send me pictures of their "wiring mess" and ask for help to sort stuff out. They made their job way more difficult than it needed to be. If I had a mass of exposed wires everywhere under the hood, or removed all the old pcm and wiring and later wondered why something didn't work...I might be tempted to give up as well...remember the old saying, "KISS" or keep it simple stupid really applies here. NOT to imply anyone is stupid, just that you need to think it through, keep it logical and as simple as possible. Take 1 wire or 1 connector, label it, trace it back to where it goes. When done, if it is still not used then remove. Factory harnesses are notorious for having multiple splices in their attempt to "keep it simple". That is why I suggest to trace the wire back to its source when removing. You may find 1 or more splices that you do need to keep part of. If you just cut out stuff randomly, you risk problems down the road....literally.
Do you keep the neutral safety switch on the 4l60e ?
Yes, I do! I would not eliminate it. It’s not hard to wire up and remember, someday someone else may own or may be working on your swap and not know how you wired it. That could be a real problem and/or safety concern. Just do it right the first time.
You wouldn’t need the tcc wire if you run a manual trans right ?
That’s right. You only need it if you are using an automatic transmission that has an electronically controlled torq converter like a 4l60e and 4l80e. Don’t need it if using an older GM automatic like a turbo 350/400, or 700r4.
Hello saw your video inspires me to do a swap in my 95 obs. have a question did you use the ls AC compressor or did you use the OBS AC compressor did you have to move location? And fuel pump which one did you use? Thanks
Thank you for the questions, you can go with the AC Delco EP381 fuel pump and it should be a direct replacement for your existing pump within your tank. This is what I’ve used for my swaps. You can use AC Delco, or Aftermarket, that would be a direct replacement for that pump. Easy to do. As far as the AC compressor, at first, I used the R4 compressor from the 95 because it worked. I modified the existing factory bracket so that it would work. Had trouble with the R4, so upgraded to a sanden style compressor. At that point I sold the truck, and they install that compressor using a dirty dingo bracket kit that I supplied with it still using the existing are for factory bracket as the base. In the 91 truck I currently have, I wanted to keep the AC compressor in the factory location, the lower mount side. A factory GM compressor will not fit. I used a dirty dingo, sanden style replacement compressor that is several inches shorter, and it fits just fine. However, having said that, I did have to modify the side frame rail for clearance. Check my other videos, I did make a video showing the different styles of AC compressors available that you can use, and also a video showing how I installed the dirty dingo compressor on the 91. Good luck.
Thank you. appreciate the feedback I will definitely look into your other videos on the AC pump.
I have a 1989 Chevy Cheyenne and I just bought a 2001 GMC Yukon Denali 4x4 is this something you cando or help do in person I live here in mesquite Tx by sunyville
I'd be glad to give you some assist, my actual physical time is very limited. After getting over covid this past summer, I quit my job and moved my dad from an assisted living facility in with me to take care of. That's why there is a lapse in my videos. There are a lot of questions to answer about your combination. Way to many to cover in this amount of space. Check out the link below the video for my facebook page and you can message me and we can go from there. Thanks.
do i need the module on my swap for the 4l60 e swap going from a 2007 5.3 drive by wire to an 1994 obs . i really dont care about the light cause my shifter is not digital its old school needle pointer
The DBW does not impact the trans. By "module", do you mean the module on the side of the trans? The wiring harness will dictate the module. If it does not match up, then you can cut and splice. You may not care about the shifter needle, but you will need the neutral safety switch to work.
@@laurencevillegarage yes sorry for that , yes I mean the module on the side of the transmission
hi i just found your channel thankyou so much for the info. i have one question though what engine mounts did you use? i also have a v6 obs and I only find motor mounts for the trucks with the 350s. Thankyou once again!
Thanks for watching!, try metaltek manufacturing for the mounts I use. Search this on ebay... 1988-1999 C1500 TRUCK K5 2WD Engine Mount Adapter Swap Kit LSx LS1 LS #14055KU
@@laurencevillegarage Thankyou so much man. Your really helping me and dad with our project Thankyou!
I've got a 96 Blazer I thought about LT1 swapping. The AC compressor & oil pan & backwards flow cooling system & computer/flash & delete(s) issues were gonna be huge due to logistics & budget on my build. I was looking at around 300.00 to delete vats, egr & tune to get it "started." Then, after that, they sky is the limit with the time guy? In my case I'd be inclined to wanna start out with completely rebuilding my engine & replacing everything "in" & "on" the daym thing coz pulling/installing engines In either generation of S10 is a nagger head. They promote FOUL language & TONS of, hours & dead presidents.
I've got a running driving LT1, Donor car. I also have a 2WD 92, S10, Tahoe, with a 2.8 running/driving in it.
Excellent video, sir.
Just my .02 Galen, kudos for the running donor by the way… But, you are going to spend some $$ going that route with an LT1. It would be less $ and easier to swap an LS based engine AND it will produce more hp dollar for dollar spent. If it were me, I would find someone who wants to swap an LT1 and sell the donor and use that coin to buy a 00-03 Tahoe/suburban with a 5.3 (around here they run 750-1400 all day long). Pull everything you need, sell off the rest and may be able to recoup your cash. For Hp, there is a lot more support and fewer headaches involved. Thanks for watching! Good luck!
the mil wire on the obs do you know where under the hood in the harness that might be ?
As I recall, look to the right of the brake booster and down a bit at the wiring harness coming out of the firewall. Look for brown wire.
Who/where modified your harness?
Great video!
Thank you, I had it modified by Chris at easyefisolutions.com
Thank u sir!
I feel can take every bolt and nut out on my truck but the wiring has me shaking. Lol. Thanks
@@ERICH819 Great!, don't let it psyche you out. It really isn't that difficult to do. You are doing the right things.
You should be worshipped!!👌🏽👌🏽👌🏽
I’m a little confused for the speed sensor wiring, do you replace the entire pigtail with the pigtail from the 95, or do you wire both pigtails into one and use the old connector or new?
I spliced the 2 wires from the OBS harness into the 2 wires from the LS harness a few inches from the plug. It could have been done higher up in the harness...at the time, I chose to splice it there.
@@laurencevillegarage Green to green and purple to purple correct?
@@cavanyaw I would need to re-look at the '95 wiring schematic, but I believe that is correct.
Thanks
Any advice on DBW cruise control. I used LT1 swap for the wire colors on the 05 LS but he doesn't show the harness colors needed for 94 OBS. Any help is appreciated. Thanks in advance. Jose
The DBW cruise is controled by the pcm. The TAC module and ECU handle the cruise control logic, and you just wire in the cruise switches to the TAC module. You would need a switch to make it work. Try this link
www.dakotadigital.com/index.cfm?ptype=product&product_id=48 Hope this will get you going in the right direction.
Thank you for the great video. I have a 97 k 1500 with a 4l60e will the 5.3 bolt up to it? Will I need a spacer?
Yes, you can use your trans. You will need a spacer kit, around $50 with bolts. Should not be a problem.
@@laurencevillegarage Thank you very much!
How did u do away with the black computer? I see you still have the factory fues block ,but I didn't see the computer ..I thought you had to leave the old computer in to run abs,AC and whatever else. I have a 96 and im going with everything you did ,but im confused because of old computer.
The old computer is still there. My factory location is in the cab behind the passenger side dash. I left everything in place as original. I only trimmed back the wiring under the hood that was not needed.
Thomas here did you use the fuse box from the Tahoe or the one in your truck
I used the fuse box that was in my '95 truck. You don't need all the extra stuff the donor vehicle has.
Do you have the obd2 port in your cab?
Yes, mounted in place of the original obd port.
Thank you so much for this video !!! The amount of information and specific details in this is absolutely priceless. Especially for me. I'm gathering all of the parts rite now and just got done rebuilding a 2004 6.0 and nv4500 5 speed manual to swap into my 1999 4 door 2500 4x4 and I have been worried sick about the wiring and how to make the ls harness work properly and have everything in the 99 truck work as it should and not be a complete nightmare, hackjob. Thank you so much for posting this video, this helps me more than you could even know and has me way less stressed and worried about doing this swap. Thank you so much for the information and help and that is a gorgeous truck and the swap looks amazing. Looks like it came that way out of the factory. Incredible work and priceless information !!!
Jared, thank you for the kind words! I’m glad you found the video helpful. Sounds like a great swap project, good luck!
Did you use the stock transmission? I have a 92 4.3 and I’m going to do a 6.0 swap, will the transmission in it hold up? Is it the 4l60?
No, I did not. I sold my 4.3/auto to help recoup some $. I used the transmission that was paired with the engine in a 2001 Tahoe. Yours is probably a 4 l60, it won't last behind the 6.0 IMO. With the 6.0, you have choices, but a 4l80e would be a good combination. Depends on what you have available. An older trans will work as well as long as it is strong enough for the 6.0 and uses an adapter.
For the fuel pump are you using a relay on the ls side of the harness? Where as the power is being fed from the ls relay and the gray wire is just tapped near the original fuse block and bypassing the original 95 relay??
Yes, you are correct. The wiring harness has 3 main relays, 2 for fans and the fuel pump. They are mounted at top edge of pcm.
@@laurencevillegarage Thanks. This is the most detailed video I could find for obs trucks. Can't wait for your next video!
Good video..17:30min why did you have to buy a few ?temperature censors
What I meant to say was I bought a couple of the sensor wiring plugs. Reason was the first one I purchased off of Ebay from a seller that was shipping from China. I didn't realize that when I made the purchase and after waiting for nearly 3 weeks, I ordered another one from a different seller that was in the US. I received that one in 2 days. Both had the same plug, but the wires were completely different on each. One had 7 grey wires all the same gauge, the other, when it finally arrived, had 5 wires of the same gauge, but all different colors and 2 wires were a larger gauge and also different colors. No consistency whatsoever.
I need more orientation I have a 5.3 ls I want to put it on my truck 1993 350 tbi 4L60 transmission I like to know what I need for the swap what tipe of harness I’m new on this ls swaps thank you
I would suggest for a first time swap to send your 5.3 engine harness out to be modified along with the pcm. This would cost more than if you did it yourself, but since you are new to all this, I think you will be dollars ahead. You'll need motor mounts. You did not mention if you have another trans to use or if you plan to use your existing 4L60. If so, you'll need an adapter and bolts to mate the two together. All these swaps involve a lot of questions you'll need to answer now and as you go. So, it's hard for me to be specific about a lot of details. For example: exhaust manifolds...do you want headers or stock exhaust manifolds? can you weld? You can use truck/suv manifolds but they will/may involve modifications to make them work. Cooling....do you want electric fans or just the engine driven fan? Is your engine "drive by wire" or "drive by cable"? Where will your battery mount? Do you plan on using an aftermarket CAI or stock air intake? Will the truck be lowered? if so, you'll need a different oil pan for clearance going over speed bumps or rough streets. How will the truck be used? What is your $ budget? What are your skills? How much time and space do you have available to use? Do your research and find out as much as possible about your swap. BUY a wiring manual for your truck. If you cannot find what you need for free on the internet, go to Ebay and buy a GM wiring manual for your truck. I just ordered one up for a '91 OBS, $20 on Ebay. You WILL need it and you WILL use it. Keep some sort of records of what you do and how you do it to your truck. In the future you may not remember how you did certain things. If you sell the truck, face it, it's a bastard!, the new owner or a future mechanic will have no idea of how you built the truck. Plan it out, make notes, keep it clean and everyone benefits and makes future maintenance much less complicated. Good luck!
Could you go more in depth on how to get the tach working ? I also have a 95 with 4.8/4l60e. Thanks!
Yes, on mine, the tach wire comes off the LS harness (red C2 pin 10) and goes to the white wire on the OBS stock harness that goes to the coil. On mine, there was a white wire with a spade connector a few inches from the coil. It was not readily visible at first. That’s all it took with my combination.
Thank you for this video very informative and just what I needed I’m very appreciative of your hard work and taking time to make us a video into detail happy to subscribe to your channel
Glad it was helpful!
Doing a 5.3 swap on my 96 Sierra . It was a manual v6 what are the main things I should know when doing this . I'd imagine it's not as simple as it seems .
There are a bunch of things....but to start, it depends on if you are going to keep a manual trans or go automatic. You will need the complete wiring harness off the donor vehicle, this means eng/trans connections. I would suggest going to one of my other videos on finding the wiring schematic for your truck and one for the donor vehicle. Each swap is unique depending on what you started with and what parts you are swapping in. There are so many combinations, it is tough to isolate exactly what you will need. The engine mounts will be needed and can be a pain to install because the nuts are inside the cross member accessible through the area around where the lower control arm bushings mount. I did it, it can be done. I used a stock trans mount with my existing cross member with minor tweeking. I used a stock (for '95) radiator and mounted twin electric fans. Used a late '90's fuel pump. I documented just about everything I did on my '95 on facebook at: facebook.com/pg/LS-swapped-1988-to-1998-Gmt400-Chevy-Trucks-1988497164501204/posts/?ref=page_internal If you click on this link, follow it to the beginning. I have a lot of info I tried to condense down to as to not be too boring. It's a lot of work, take your time and do your research, gather all the parts you think you need, then start. Have a plan. At times it may feel like 2 steps forward and 3 back but it will get you to the end. Decide who will do the harness, (you or pay someone), study the diagrams, even if you don't do your own harness, you still need to connect stuff up and you need to know where to put it BECAUSE if you decide half way in to take it to someone else to finish, they either won't want to touch it or will charge you $$$ because they have to figure all that you have done. Don't let this scare you. I am not a mechanic, and I did almost everything on my own, and it all works. Good luck!
who did you send your harness to? my dad has a truck like this once the motor is done for he wants to give it to me and i want to do this swap im just stumped on the harness
I sent mine to Chris at easyefisolutions.com We talked on the phone about what I wanted and wrote out a page full of info so he would know how the truck was equipped. I had additional wiring added for twin electric fans and had them set to come on at a 185 and 195 degrees. No issues.
what's the best year to swap on 1995 Silverado I got a 5.7 automatic transmission? I like to go with 5.3
It all depends on what you ultimately want, your budget and can you do most all the work (including some light fabrication) on your own. If you want to just do a LS based swap and need to do it on a tight budget, a 5.3 is good/economical choice. For added simplicity and ease of installation, I would go with a DBC (drive by cable) throttle body motor. If your current trans is in good shape, you can connect it to your 5.3 with an adapter. Don't need electric fans, the truck based 5.3 engine driven fan is fine. Exhaust manifolds, you have some choices, can be pretty cheap if you can modify truck/suv to work fine (that's what I did). Wiring will be your big choice. Do you modify the harness yourself or pay to have someone else do it? If you do it yourself,
I have a stand alone harness for my 93. Can i use the old heavy gauge starter wire for the new pcm “crank” wire input? Cant seem to find a low voltage wire for the pcm
I would suggest going to lt1swap.com and look at your pin outs. I would normally say you can get away with using a larger gauge wire, but, in this circumstance, I don't want to tell you something without being able to look at it.
Can you tell me what purple wire you use to hookup the abs,tcc wire on the abs unit? On my abs plug that you hooked yours into mine has 3 purple wires, one on top of plug 2 purple on bottom,so out of 3 purple wire what one do I splice into?????the if u look at your plug on abs unit it has 3 purple wires ,
On my 95, there is only 1 purple wire, it is located on top row position 3 of the 5 wires. So, middle of top row. Hope that helps.
Thank you, this video was very much helpful, as I am planning to swap my current 1997 chevy Tahoe to 2002 LS. but need to know something: what if I get the hall wiring harness from the existing 2002 Yukon XL and fix it to my 1997 Tahoe, is that will be batter or to order new wiring harness.
That is what I did. At some point in the future (way down the road), ordering up a new harness may be preferred just because the old harnesses will be 30+ years old and may be questionable. But, for now, let your wallet (and common sense) be your guide. If you have a good harness, then modifying it makes sense to me. If this is your first swap (and you plan on doing more in the future), then consider (if you feel confident after much research) to go at it yourself. You will want to do your research. I was timid and had mine modified by easyefisolutions.com. After getting mine back from Chris (great guy and did an excellent job), I looked it over and it sunk in that I could do this. The first time is intimidating, but I will be doing my own coming up soon. There is a lot of great info to help you out there. I would suggest going to lt1swap.com and reading everything Brandon has then check out his youtube videos. That will give you the confidence you need. And, if you do try it and it doesn't work, you can still send it in and have it modified. It will still probably be cheaper than buying a new harness and the experience and knowledge you gain is worth tons!! Good luck.
Hi I have 1993 Chevy tbi 4l60 4 speed do I have to connect the purple wiri my transmission I think is different then yours
If you do not have or use a later model trans w electronic torq converter lock up then no you would not need it.
what size transmission are u using
4L60e
Can you tell me little more about the wires you hooked up?are they the wires that should have went to a aftermarket fues box ? Im talking about the bottom wires on your bored..so all you had someone do is clean up harness and add relays for fans and label the wires that needed added to factory harness..also if you Dont mind,, who did your harness,ecm?? Tcc,tack,brake wire, are they wires that was on ls square block with injector wires ??? Im doing same truck right now and the wiring has me beat.my truck same year as yours,I just put 6.0 ho out of Escalade in it instead of 5.3... If you could give little more info, I would be thankful....
(are they the wires that should have went to a aftermarket fues box ?) I assume you mean the wires with the blue asterisk. No, only the first 3 go to the fusebox.
(who did your harness,ecm??) I used easyefisolutions.com, I believe the owners name is Chris. I sent him my harness and pcm. He had a list of questions so he would know some specifics about my application. I added additional info such as: I am running twin electric fans, what length to make that specific part of the harness, I provided the specs to the cam I installed, rear gearing, tire size, what temps to turn on fans, tweak the shift rpms a bit, remove all the flex-fuel stuff etc.
( Tcc,tack,brake wire, are they wires that was on ls square block with injector wires ???) Not sure about the "square", I assume you mean the Tahoe fuse box. These were the "labeled" wires that needed to be integrated into my existing harness/connections. As I mentioned in the video, the VSS I did not need. This seems to be more needed for an aftermarket speedometer, so I spliced my existing wires into the Tahoe wires. The MIL light requires you finding the brown wire with white stripe, cut it and attach the MIL wire to the one exiting the dash. The TCC wire is spliced into the purple wire coming off the abs computer. I'm sure it can be spliced in other places, but I did it about 10-12 inches from the harness on the front of the abs unit. The tach was the easiest, find the wires from your original harness that went to the coil. There is a folded over, unused spade connector very close to the coil. You can splice to that or as I did, use a spade connector and just attach. Although it does seem pretty easy, it only took me a month to figure it all out. If you have any more questions, feel free to ask.
@@laurencevillegarage do you live in California I am getting ready to swap my 97 as you did but CARB says I have to basikly take every thing smog related from 2005 evap sys canisters every thing is that what you did
Hello! First off great video. I'm in the middle of doing a swap in a 91 c1500 . How ever the doner 02 yukon was hit at the fuse box side causing wires to be torn at the fuse box. All the wires going to the PCM are still in contact and connected. Do you think I can still make it work or would I need a stand alone harness at this point? Thanks!
The short answer would be, yes, as long as your harness is not damaged badly, you are ok. Do you plan to rework the harness yourself or send it out to be modified? In either case, any damaged wiring can be fixed. It will really help if it’s all intact w no plugs missing. Just try to keep your complete engine/trans harness intact and you should be fine.
@@laurencevillegarage right on thanks! All the plugs are there I took them off after removing the 8mm bolts holding them on the damaged fuse box, but as stated some are damaged and dangling at the ends but over all the harness is all one piece. I'd like to save me $ and work it my self but at the same time I might be better off sending it out to someone but don't know who. Will see. But for now I'll keep wrenching till I get to that point
I used easyefisolutions.com for my harness, Chris did a good job. I had him wire in dual electric fans as well. Took 7-10 days.
@@laurencevillegarage thanks I will send them an email and see what they suggest. Any questions I'll get back to you
I have a 96 I’m trying to swap a 5.3 into mines and I need someone who can do the harness for me. How much would you charge?
I would recommend Chris at Easyefisolutions.com, he did mine and I was very pleased. You would need to call and tell him your specifics to get an accurate quote. Mine, with electric fans was ~$560
Wanted to ask the question about the Tac wire. Where exactly does that wire tie into? I have a 1991 Sierra. Working with an 02 harness.
I just ordered a 1991 Chevy factory wiring manual off of ebay for $20, it is a gold mine of information. You need to get one. Prices vary a lot, but you can find one for a good price. It is worth it! It will help you find what you need.
Hi. If you heat those 2 plugs on the shift indicator module with a heat gun they'll come right loose without damage. I only heated them about 10 seconds.
mine had so much glue on them, I don't think it would have helped. I'll give it a try next time, thanks.
What part of Texas are you located I’d like reach out to you
I'm in Sunset, between Bowie and Decatur....In the description below the video, I have my email as well.
Did you have to change your dash for the swap?
I have a 2000 Chevy with a 6.0 that I wanna take out and put in my 92 with the 4.3
No, no changes to the dash at all.
Man thanks for all that info!
Very good video grrat explanation do you know where to buy a harness for my 96 2wd silverado to 5.3 ls swap
If you have the engine harness that came with your 5.3 you can get it modified if you don't have a harness, one can be purchased from a variety of vendors who cater to this market. I sent my harness to Chris at easyefisolutions.com and he modified mine to work great. You can also purchase a used (ie salvage yard harness) that is at least close to your application and send that in and it can be modified as well. You did not mention if you have a pcm. If you have the one that came with the 5.3, a variety of sources can reprogram that for you for under $100 (depending on the extent of your modifications). If you don't have a harness or pcm to begin with, it will be more expensive. You can contact a supplier that will be glad to make a harness for you and supply the pcm. It will be more expensive. Need more details to be anymore specific than that. Good luck.
Can you tell me what you did for your fans,how many you running? And what are your turn on and off temps for both?? Thanks again. .
When I had my wiring harness modified (Chris at easyefisolutions.com ), wired it for twin electric fans. I purchased a set of "clone" 2010 Camaro electric fans and had Chris set the pcm to turn one on at 185 and at 195 degrees. If you plan on running a/c, let the one modifying your harness know this. Depending on which pcm you use, there are other features that may be altered. I say "may" because the LS based pcms in the early trucks had engine mounted fans, not electric. Whereas the cars, I believe all had electric fans to begin with. Features such as increase idle when a/c is turned on and to automatically turn on a fan when a/c is started. The latter, I have a video showing how to wire in a fan relay.
Many people seem to be running ac with their LS swaps, yet no-one seems to break down how to do it the best way. I don't recall going into detail with this with Chris. If, I have someone build my harness next time, I will ask more questions. The first time, I didn't know any better.
Very nice video! I'm think of doing this swap. Lots of valuable information!
Doing a swap on my 92 k1500 this spring/summer. This def put my mind at ease. Not nearly as scary as i made it out to be lol.
Great to hear, good luck with your project. It really is not as scary as you might have thought. Get a GM electrical wiring manual (not a disc) a real manual. It is excellent source of information and is not that expensive. I get mine off of ebay...depends on year, but I have paid as little as $11 and as high as $30. It is worth every penny! You can always sell it in the future if you move on to different projects and don't need it anymore. Me, I keep them all....you never know when you might need it.
Great video. Lots of information.
What size are your wheels and what are the offset specs?
The front wheels are 17x7 with a 4" bs, the rears are 17x8 w 5" bs.
@@laurencevillegarage do have fb looking to get some info from you thanks