1995 - 2002 GM OBS Truck Wiring Harness Grounds and Where to Find Them (Chevy, Cadillac, and GMC)
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- Опубликовано: 27 июл 2024
- In this video we go over GM service information for where to locate primary ground points to the engine, body, and frame for the factory wiring harness schematics on GMT400 old body style (OBS) trucks and SUVs. We will cover how GM does wiring component zone numbering, service bulletin wiring errata, ground location descriptions, ground location diagrams, and actual footage of each of the primary ground attachment points on both pickup and utility truck bodies. Location views are specific to either the 6.5L, the 5.7L, or the 5.0L V8 engines of these years. For pickups the 1500s ended in 1998, the 2500s ended in 2000, and the 3500s in HD form lasted until 2002. The Suburbans ended in 1999, and model year 2000 is limited to Cadillac Escalade, and Chevrolet Tahoe Limited/Z71. This video only applies to OBS C/K trucks.
The eBay and Amazon search links below are paid links, for which I may be compensated and earn a commission, if you choose to buy the parts and tools shown in this video thru them:
While most of the ground attachment points are part of the wiring harness, there are a few braided strap style ones that can be replaced separately. They vary in length depending on the engine equipped, and the alternator amperage output rating (and whether the truck had single or dual alternators originally). Measure your original one for the particular ground straps here. Ground strap G111 (GM 12157175(15"), GM 12157181 (13"), GM 12157185 (18")), and ground strap G110 (GM 12132154, GM 12157174 (24"), GM 12157178 (18")): ebay.us/ALGqvk
GMT400 type GM factory C/K truck service manual I used in this video: ebay.us/WXryxg
And if I've saved you some $$ here, consider some coins for the coffee tip-jar! ko-fi.com/drshock
1995 1996 1997 1998 1999 2000 2001 2002
Chapters:
0:00 - Service information zoning overview
1:47 - Service manual errata example
6:55 - Ground location text descriptions
8:00 - Ground location diagrams and video
Corrections:
19:27 - I should have said that ground is G111, not G110.
Chevrolet Cadillac GMC Holden Suburban Yukon Cheyenne Silverado Tahoe Blazer Escalade W/T
#drshock #chevytrucks #suburban #cheyenne
Disclaimer: DrShock, the alias for the human content creator for this RUclips channel, is not responsible for any damages, injuries, losses, or liabilities associated with any repairs, upgrades, or maintenance performed on yours, or any other, vehicle whatsoever. No warranty, express or implied, is made as to the accuracy or completeness of any information provided within this channel. Viewing and using the “as-is" information of this channel is totally at your own risk. Always wear personal protection equipment and follow appropriate vehicle manufacturer service manual guidelines with original manufacturer parts only when performing any repairs, upgrades, or maintenance upon any vehicle. 
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FYI, one verbal mistake at 19:27 I didn't catch during video editing is that I should have said that ground is G111, not G110. The G110 ground does attach to the same frame mount point, but then heads off towards the back of Vortec engines. Only the G111 ground strap attaches to the firewall below the heater hoses. We covered G110 at 12:22 of the video.
Glad you edited that. That's the one I needed. Thank you
So where does the other ground strap that's coming off the G110 bolt go to i can't figure out where it connects
This is not a typical ''you learn something new every day'' video, it's a ''you learn a lot'' video! Thanks so much for the detail and step by step instructions.
The good doctor shows the parts in question better than anyone on the planet. NO ONE DOES IT LIKE THIS. This is a master class on camera work that blends perfectly with the informative narration. A+.
Someone give this guy a reward i felt like i was in school. Props to you man I appreciate teaching me some valuable knowledge
Amigo, excelente video, muy informativo, 2 años sufriendo con mi camioneta, 13 mecanicos y mucho dinero gastado en sensores, bobinas, partes del distribuidor, y mi camioneta quedaba igual, vi tu video, y en 1 dia arregle, limpie, y lubrique todas las tierras, y mi camioneta quedo como nueva,,,,, de todo corazon, te doy las gracias, y quedo suscrito a tu canal, te mando un fuerte abrazo y te saludo, desde monterrey n. l. Mexico.
Muchas gracias
El Show de Xuxa!
Que falla tenia tu camioneta @sergiomalacara3582
Que falla te hacía bro
Great video, did not know about section for the grounds. Thanks
Now why don't they teach something like this that we can use in 18 years of schooling ? Were I learned very little useful information ? I studied wiring diagrams for years , one little short video put all my questions to answer ?? Bravo ..is this top secret information ?
Hands down the most informative automotive repair video I have ever seen and I've seen about a million of them. Thank you thank you thank you😀😃😄
This video is so helpful for my problems on my 2001 Silverado 1500. Thank you very much for posting this video.
THANKS SO VERY MUCH FOR SUCH A DETAILED VIDEO!!! I was looking for ground issue myself and stumbled on this video and was blow away by all the info! Absolutely critical knowledge if your a long time obs owner. I learned a lot about reading wiring diagrams/service manuals also. I've always been a Chilton/Haynes catalog guy but maybe worth checking out service mans too. Again thanks so much for all the info and the live shots on actual trucks was a fantastic edition, even using lights and mirrors wow SO helpful. We appreciate the time you took for all those details.
I swear u became a legend when u made this video thanks alot
Great info. Saved this video to my library for future reference. Thanks for sharing 👍
Excellent video work. Thanks for sharing your knowledge. I'm renovating and restoring an OBS half-ton truck and need help understanding and reading the wiring diagram for this era truck. This video helped to fill a void in my knowledge. Very good work.
Wow! Very detailed. Awesome job covering this subject of grounding wires. You didn't mention the 4.3l vortec, but that's ok because it is the same as the gasoline 5.0l vortec.
Thank you for this video ( from a backyard diy guy with a 98 chevy c1500 w/t Cheyenne )
Excellent video,great detail and especially camera work,thanks.
I know I commented on this a long time ago but this is super useful again. Not sure if I can thank you enough haha
This info was very helpful got my 96 c1500 silverado 5.7
You actually taught me something today so I want to donate $2.50 to your cars and I will show the same thing and do knowledge so for real I've been doing it for 20 years and you show me something today and if you have the systematics for Mercedes-Benz oh man you're a Savage that's what I do
🤯🤯🤯🤯🤯🤯omg! I was searching to find out what this unhooked wire harness was on the top of the firewall of my 97 GMC, and I figured it was going to be impossible to find a specific video on it as I’ve searched it out and lo and behold at 09:00 you point out that very harness for me. How crazy? Thank you!
Thanks for the information 👍👍👍
Always the best. Thanks for explaining
Thank you. Will be ordering a service manual
Very informative and detailed. Thanks man u helped a lot.
You're awesome! Thanks for posting this.....you saved a ton of people from headaches. I'd buy you a beer if I could. Anyway thanks...Yay!
This is awesome, thank you! I wish I would had watched your video earlier before just blindly looking over the 95 service manual and trying to see how it applies to my truck.
As far as I can tell, I had major fan issues and issues with the truck turning off whenever it wanted to because of a minor ground at the front of the vehicle. I may make a video to highlight my issue but if I do, I’ll include a link here because you have done an awesome amount of work to make it easy for someone to figure it out.
Sorry for the run on sentences, but you’ve done great work!
Great video very informative easy to follow
Very informative. Thank you
Excellent video!
Thank you very much. I am refurbishing my 2004 Hummer H2 and building out into an overlanding vehicle so I'm going over the electrical and upgrading the big 3 but more like a big 5.
Awesome content
the video ive been looking for
Thank You Very Much... You have Been Very Informative.!
All of The Various Points to Search out a Bad Ground is Very Useful..... I Suspect a Bad Ground for My 2000 Yukon Xl ABS - BRAKE LIGHT Coming On While I'm Driving... I have to Start Somewhere....as It Is Very Annoying....!! BillinL.A.
11-05-2021.
Thanks for this video.
Great Video. Thanks.
Thank you, this saved my a$$
Exceptional
Just found my ignition control module ground wire @ G 101 to be broken at open barrel eyelet terminal....causing a crank-no start...great video
.....actually going to locate all major ground locations and do a visual inspection and re new contacts as a preventative measure
You can find the GM part numbers for those straps in the description.
Blessings dude 🙏 🙌
you can spray down any sketchy ground or other wiring with WD-40 to make an instant connection. nice is your broke down by side of road.
Your abs videos brought me here! I did an ecm swap on my 97 k3500 to a newer 0411. It doesn't have the cel on, but my OTC scan tool shows a code of U1300 "class 2 comm short to ground." Have you heard of that?
Not specifically, but the code would imply the data line for serial communications between modules is shorted. Likely a chafed area of the harness insulation.
Thanks.
Can you do a 94 5.7 tbi? My temp and speedo gauges arent working. I need to know where the grounds are because im missing the one at the thermostat, I need to know where it goes when I re do it
I got the same problem. When I start my truck, those two gauges go to Max. I got a 95 Chevy Tahoe
@@Hka-zn4qvixed mine. The two wires that ground to the thermostat bolt were wired in to the alternator wiring by a shade tree mechanic I guess before I bought the truck. I spliced them and put a new connector and grounded them to the bolt and my speedo and temp gauge work like it should after a year of hunting for the problem. If you have yours just make sure they are tight and clean without any damage to the wiring. As far as your temp gauge going to the max I’d check the temp sensor that’s in the side of the block on the driver side, also make sure there isn’t any air in your cooling system. I know after a coolant flush or thermostat change sometimes that will happen. But idk in your case.
Really great video.
Do you know, the Grounds for find shortcut to ENG-1 fuse blowing. ? I dont know the diagram.
Standing ovation
thanks good video... these grounds make the lights act up and and all kinds of issues
Another outstanding video! I am in the process of rewiring the alternator, battery and starter. I have a 1994 Suburban (vin f) diesel suburban.
I have the 94 factory service manual, diesel supplement, and electrical supplement---but I can't find the nice ground location and number chart that you show in your manual. I notice a significant driveabity improvement when I replaced the starter cable and the cable going up to distribution busse. I want to address all the potential ground issues at this time---any suggestions on where to find a listing etc...similar to what you used in video?? I will of course make a coffee contribution...lol
As best I recall, pre-1996 manuals had many more different "books" with supplemental information across them to the base service manual set. I don't recall which supplement book would have had this, but I would expect it in perhaps the electrical diagnosis supplement, emissions wiring system supplement, or engine electrical supplements. In 94-95 there were supplements with these names but I don't have them in my possession. There are likely PDFs of these out there as well.
Great video. I’ve got on an issue on my 99 Silverado 5.7 not having turn signals at all. Any ideas on what ground or ground I should be looking at?
Could be the wiring harness, or the switch on the column as well as a ground. Try the wiring harness test in this other vid to see - ruclips.net/video/wbil2Cj2r_E/видео.html
I have a 2001 GMC Yukon 5.3 that suddenly the Cruise Control and Fog lights stopped working at the same time? I checked all the fuses and relays. The fog lights relay has power and I can hear it click when I push the button, the cruise control dash light doesn't come on anymore. I'm 99% sure these issues are related. The other thing is I get 12v at the fog light bulbs but it's not enough current to light them ? So I'm thinking the ground somewhere is broken or weak.. do you have any suggestions where to look? I've been going through everything I'm stumped. Maybe it's under the dash somewhere.
Excellent video. Im trying to find a copy of the manual youre using in this video but the set comes in 4 different volumes. Do you happen to know which one youre using here?
Thanks. Much of the service manual content is model year specific, and the location of information will vary in the volumes the older back you go. But for the 1998 manual I was showing in his video, ground wiring information is volume 1. There's a search link in the description.
I may have missed it, but can you let me know where the ground is for the 4x4 actuator on the front axle of a 1998 Chevrolet Silverado Gas with a 5.7 Vortec? Thank you in advance. Having issues with the 4WD high.
The ground point information here is not at that level of granularity. You'll need to locate an electrical schematic specific to the actuator module, for your specific model year as these grounds do change, in order to find this out. It will tie back to one of the points this video shows, but the schematic is the only way to confirm which.
Fantastic video! Are you referencing a Hayes or Chilton manual? If not, where can one buy that manual?
Thanks. This would be the GM service manual, there are links in the description but these have been out of print for a very long time.
need that book need to find the fuel line ground for my 2000 S10.
great video. well done. any idea where the computer ground is located for a 1996 chevy suburban 5.7 vortec gas?
The ground straps I showed are part of the VCM (vehicle control module) grounding path. These are common across all trucks with that engine, doesn't matter if its a pickup or a SUV. There isn't any specific service information as to whether one strap is more important for the VCM than others, you really have to make sure they are all there just like the 5.7L Vortec V8 I showed in the vid.
Hello, and first thank you for the detailed video. I learned alot. One thing I do need help with is in my 1998 gmc sierra k 1500 5.7. My MAF and Crank shaft Position sensor are both setting off my check engine light. I replaced both the sensors. Also when I took a scanner to it, the MAF read at 0.0 which means it isn't registering anywhere. I'm thinking since I replaced the sensors, it's a wiring issue. I'm not good at wiring. Any ideas or help/information would help!
These can be very difficult to diagnose. You will need a service manual, or some source, for the wiring diagrams for a 1998 C/K truck. There are links in the description where you might find a hardcopy one. You can also access them, for a fee, thru GMs www.acdelcotds.com website.
Follow-on to my last comment: My 99 Suburban 5.7 has an occasional issue of cranking and starting, but cutting off in about 1 second. I try starting about 5 times, and it still cuts off after 1 second of running. When she does start and run, the engine runs excellent. Fuel pump was replaced about 10,000 miles ago, and seems to be purring fine. Could a corroded/failing engine ground strap cause this issue of it cranking/starting and cutting off after 1 second?
Is your security light on?
Excellent post, very informative. My 01' Tahoe is having an issue with the secondary air injection pump, it comes on and shuts off when it's supposed to but it doesn't seem to be seen doing this. I suspected a ground may be the culprit and according to my service manual wiring diagram it is grounded in the PCM and needs the ground to function. The fact it does indeed function brings me to the thought it is grounded but I'm curious if theres something in the monitoring system itself that isn't getting a good ground or if I'm just way off base here? I'm in California or I'd just remove the secondary air injection pump all together. I know I'm just missing something simple here but tell me, what are your thoughts on this? Would you pursue a grounding issue or could my PCM be malfunctioning? What direction would you go next?
You state this situation somewhat contradictory. You say _it comes on and shuts off when its supposed to"_ and that _"it does indeed function"_ as expected. So what is the problem here if it's working as described? If the pump where completely inoperative, or visually confirmed to be intermittently inoperative, I would proceed with a basic powers and grounds to the pump diag. The service manual for 2001 new body style Tahoes likely has a test table for this. If power is _always_ confirmed available, but ground is _confirmed_ by visual inspection test to be intermittent, then it's either in the wiring harness or PCM. You would have to do further diag to eliminate the harness first, as the less expensive of the two grounding paths.
@DrShock Sorry I wasn't more clear. It does indeed function but the rest of the vehicle apparently doesn't know that because it keeps giving a secondary air injection pump fault. My diagnostic tablet sees it running as well but the truck PCM won't acknowledge that it sees it or mark it as ready to take it through smog. I'll look further in the service manual, I must have missed something. Thanks for replying.
Got it now, so if the pump is running I would focus on probing the signal line the PCM uses to monitor it's performance. I don't have that manual year handy, but it's should be in there in the diag tree for that particular DTC you are getting.
@DrShock the 5v signal wire, didn't see that one but I'll look again. That makes too much sense, thank you.
Great info very understandable 👍 question I have a 99 gmc suburban k1500 5.7 is there a ground for the fuel pump if so where can I find it?
Thanks, yes there is. Should be one of the two locations I showed for that in the G404 area.
I have a 1999 sierra extended cab pick up and I can’t find the ground wire or the fuel system. Is there anyway you could let me know where it is located
Which volume of the manual is this? Thanks, very helpful video!
For the 1998 2nd edition I was using, that would be volume I. But that content may appear in different volumes for different model years.
I've got a 2003 P42 6.5 diesel. And I've seen some 6.5's with grounds on the intake but I can't find one. Any idea?
I'm not familiar with the wiring on P trucks, it could very well be different than C/K models even for the same engine. But all of the factory installed C/K grounds, from 1995 and up, are covered in the service manual we go thru in this vid. That's mostly going to be thru 1999, though the 2500s lived on until 2000 and the 3500HD lived until 2002.
Hello I’m having trouble finding out what g101 goes to, my turn signals and brake lights and side markers are not working. I replaced my front clip and I just found the plug coming from behind battery at the ground was unplugged. Where does that plug in at?
It's just as shown in the video, G101 just screws into the inside fender sheet metal next to the battery.
So if wire g404 go wrong. Would that make my leveler not work??? And also make my fuel lite stay on as well even if I fill the gas tank??? ... Thank you in advance
Tough to say, you would need a wiring diagram for the option to confirm which ground is involved on which circuit for it. This kind of detail can vary from model year to model year, and even between body styles and options.
I have a GMC Sierra 2500 HD and my issue is the right flasher is blinking fast but also the flasher light in the right hand mirror is not functioning
Along with the interior lights that don’t come on when the doors open. Could this be a flasher relay issue? I also read somewhere that it could be a ground wire issue on the right front rail but there was no mention of the location of this wire on the frame in the discussion forum. I have changed the lights bulbs with new ones so I know that wasn’t the problem. Any suggestions would be appreciated as don’t’ want to go to the dealer for which could be a small issue that I could fix. Thanks
I'm not that familiar with the later design trucks, the new body styles. But I'd expect this to be more of a wiring harness issue than the relay given interior lights also inoperative. I'd start with the interior lights, simplest circuit regardless of model year. And with a service manual electrical schematic, trace out where you are losing the +12VDC and/or ground to them. Definitely not something that is repairable without the service manual and its schematics as otherwise you'll just be shotgunning in the dark.
Shawn , Since I can only think- Speak in Layman's terms... Basically - we probably have All experienced. : when one Bulb of the Turn Signals , or Parking Lights Burns Out , it
Shows up on the Dash as a Rapidly / erratic flashing Signal...indicating Something is Not Correct, a Circuit of 12 volts that used to Operate Perfectly... Now has a fault ...( i.e. - a short / Bad Ground/ Burned out Bulb that Needs Replaced...etc. ) Probably a few a other Factors... That I haven't even Thought of Yet... The Main thing is Don't Panic...think it Through...make a list of things to check...things it could be..... Try to trace it Down... ( mentally & Physically... ) That's how I tackle these Idiosyncrasies.
Then, if that fails... There is Always the " Automotive Electric Repair Shops " , but make Sure to shop around for a Good Estimate...and Timeline... Hopefully - You could just wait... While they Diagnose it. I have a place I go to in Los Angeles... You just Drive into... They Immediately Start Going Thru it... Taking things apart...( such as the instrument Panel Cluster/ speedometer....I was Shocked.... At the end of 30-45 minutes...they Discovered-- I had Unplugged my " cruise Control Module" on my 90 Chevy Van---- thinking it was part of an OLD ALARM SYSTEM...that I thought I was remedying.... I went Home...after Paying only $20.00. And plugged in the Module...and I had Cruise Control Again. Live and Learn...Sometimes- we just Cause our Own Problems..!!
Sorry I don't have a Specific Resolve to Your electrical Issue... Best of Luck.
BillinL.A. 11-06-21.
Any1 know where the ground is for the 4x4 switch on the front actuator is on a 1996 k2500 6.5 turbo diesel? Any help would be appreciated.
I have a 1994 GM Fleetwood Southwind Storm (P32 chassis) 454 TBI w/4L80E trans. Do you have any info on ground wire locations?
No, I don't have any service information for the P chassis. There is a separate service manual series from GM on those.
Hello,DrShock good morning, how or where can I get that manual? I have a 1997 GMC and the ground cables that it mentions with the number 110 that is attached to the frame on the passenger side in the direction of the cylinder, but another one comes out from there that I don't know where it goes If you could give me the information where I can get that manual, I would appreciate it.
GM service manuals for the old body style 90s trucks have been out of print for over a decade now. But there's a search link in this videos description where you might find an used set.
An alternative is you could _rent_ electronic access to the manuals still directly from GM. They won't let you download anything, but you can view them for a small fee at www.acdelcotds.com under the Service Information subscription section.
My brake lights are not working properly. When i have my key off they work good. When i turn the key on my brake lights stay on and when i apply the brakes they turn off.i replaced the brake switch as well.
In need of some serious help. I have a 95 sierra . I can't find a book like yours with all of the details. I'm trying to find where the ground is for the blower motor, and the climate controls. I have replaced the controls, the resistor, the relay, and the blower motor. Now I'm at a loss. Still can't get the fan to work. If you have time, I would appreciate it dearly.
Never load up the parts cannon on these types of problems. ;-) It will be the same as tossing bills out the window down the highway. Here's a link to the 1995 PDF manuals where you might find what you need - www.gmt400.com/threads/88-95-service-manuals.43575/
My 99 6.5L keeps stalling and the last time it stalled I got a code for C2801 - chassis. Not sure what that means since I have wasnt able to locate anything on google about that code. Does that sound like a bad ground somewhere? Love your videos, i think ive seen just about all of them up to this point!!
Thanks. C2801 is not a valid GM code for 1999 old body style trucks (the GM service manual lists all possible codes). I'm going to have to suggest that either you have a typo here (maybe C0281 ?) or you're using a Chinese type scan tool and it's got a software bug/typo in the code it's reading out to you. Stalling on a 6.5L is _usually_ a failed PMD though.
@@DrShock Thanks you, that could be the case using one of the amazon ELM327 Bluetooth units to Torque PRO.
If in fact it is the C0281 code then do you think a faulty brake switch could be the culprit to the vehicle shutting down if the PCM isn't loving the open circuit or faulty switch?
No chance of such a brake switch circuit code stalling the engine. You more likely have more than one thing going on at the same time.
I like to see the 96 Yukon vortec 4l60e wire harness part
Ground g110 for the 5.7 gas
.. connects from under the heater , to frame, then to what ? The block?
There's a verbal typo there that the pinned comment at the top addresses. G111 runs from the firewall to the frame. G110 connects to the same frame mount point, but then to the back of the passenger side cylinder head for the Vortec 5.7L.
I was wondering is this manual is available? Or if you do have any copies of it, I am most interested in the 100 and the 200’s
I put links in the description where you might buy these GM factory manuals used. They have been out of print for many decades now.
I didn’t see the particular service manual you were quoting from. That I what I’m looking for. I has the information I need. Can you tell me which one it is?
So I have a 95 silverado, and cant find any more ac control panels without paying over 600 for one, Is there anyway I can get a wrieharness for a 96 ac panel and put it in my 95?
That 95 AC control module's wiring harness was a one year design, idk why. There are companies that made adapter harnesses so you can connect the more common 1996 and up version, here's an eBay affiliate search link to find those: ebay.us/sgGxII
You may have a short causing the control panel to fail, this other video might help down the road if so, ruclips.net/video/JTPqMlK_0b4/видео.html
those adapters worked for my 95 yukon i swapped the climate control unit with a 96 unit
@@DrShock There are quite a few differences that are individual to the 95. I describe it to people as that Chevy started to make changes, but didn't finish until 96 with the inclusion of OBDII. Proud 95 C1500 ext-cab stepside owner. Thanks for the info, btw ! The 95 repair manual didn't have some of this info regarding the zones, just the schematics. :-)
Were I can't buy that service book. I have a 2000 chevy blazer Ls 4.3 v6 vortec. Have problems with the abs need a book
Should be a link in the description where you might search for an used one. They have been out of print for well over a decade. You can also rent access at www.acdelcotds.com.
Can you make a video for the 1994-2004 Chevy s10 4.3l cpi
HELP.
I have a ground problem. I turn on my headlights and the wipers come on. Same when I use left turn signal. Replaced multi function switch and still have problem.
Can you tell me where the grounds are for headlights and for wipers.
Great video by the way.
Nevermind I found it. I missed one during the engine swap lol.
Where was it, I’m having problems and i just did a swap, may have made the same mistake
Would a loose ground wire cause my ac (compressor) to not work (engage/come on/compress the gas). It went out intermittently until finally not working altogether. After installing new ac compressor, lines (everything under the hood), it still does not come on. Checked relays and everything.
If it is the ground wire, then which one and my 5.3 Vortec?
It would be unlikely that a problem with one of these primary ground points would affect only a _single_ component. Ground problems tend to affect groups of components, or even all components. For what you describe, presuming a correct R134a refrigerant charge and known good AC line pressure sensors, I would focus only on the air conditioning wiring harness for a short to ground, or an open. This will be a time consuming process, as you'll have to visually inspect every inch of the harness under the hood and behind the dash, as well as meter out for opens each individual wire.
@@DrShock Groups...Okay, cruse control, four wheel drive, AC, keyless entry...
There is a while, not on the right with the main engine ground strap, but on the passenger side of the vehicles. It comes out of a bundle of wire, goes behind the engine, and is grounded at (apparently), the same bolt as the engine ground strap.
I suspect it is corroded, broken, or otherwise not making contact or full contact.
The relay has power...the clutch works when tested...something is not sending a "go" single to the compressor clutch. (Something deep, mysterious, and evil under the dash I suspect. Or, that think, 12-guague ground wire is not making full contact.
Try checking the dark green wire out from behind the control module on the dash all the way thru the various sensors. This line can sometimes short to frame ground, and prevent the compressor from kicking on.
For the years this video covers, any grounding wires or straps you find under the hood that I didn't cover are unlikely to be factory original and more likely to be some later modification/alteration.
@@DrShock dark green wire... I'll check it out... Thanks
Please help bro🙏🏽 my truck lights (k1500) ‘98 work and all but when I try to start it clicks, got a new starter and the same things happens, battery is new and I tried to jump it but nothing works even tried the wire from the fuse to the battery and nothing just one loud click what could it be?
Presuming not the battery and not the starter, but the starter motor clicking like when starved for cranking amps I would inspect the cables from the battery to the starter motor for either internal corrosion or poor connection. Sounds like a high resistance type issue.
How about the ground for power door locks on a 2002 2500hd crew cab? And where can we get a manual like that
The GM manuals went out of print many moons ago. But you can find them used from time to time. Search links are in the description.
@@DrShock thank you!
Is that a Haynes manual? My uncle has an OLD ONE for 88/98 ck1500
No, this is the GM dealership type service manual.
I have a 1995 Chevy silverado with a 5.7 k1500. My problem is that a year ago my truck got stolen and I got it back in less then 10 minutes because the idiot stayed in the apartment parking lot and I found my truck . so my problem is that he did damage my ignition. And I replaced it but now when I step on my brake pedal my right turn signal comes on like its a brake light. Any ideas ad to how i can fix this . none of the wires on the column were damaged.
I'd check the multifunction switch (turn signal switch) wiring and where it physically comes in contact with the brake switch wiring. What you describe is clearly in the wiring harness, some damage giving the brake switch circuit an alternate path to the turn signal.
@@DrShock I will check that out and will let you know the outcome. Thank you for your help and timely response.
For grins see if you also get any brake lamp activity with the turn signal engaged.
Where can I find a book like you have of 05 Silveradoi 6.6 lly Duramax
Only source for older vehicles is going to be used GM books on eBay (I have a link in the description for the OBS series). GM only sell them in print for a few years over at www.helminc.com/helm/search_service_owner.asp?Style=helm&class%5F2=CHV
Which volume is this?? Looking to purchase the same one.
GM did move this information around year to year. I was showing a 1998 2nd edition service manual, and for that set only the information is in volumes one and three. Volume one will introduce wiring systems and how to read the schematics as well as an overview of grounds. Volume three will cover electrical schematics particular to each engine.
@@DrShock awesome thank you so much I’m trying to figure the ground for my 1998 k2500 suburban with the 7.4L vortec. I’m currently looking on eBay but I see they have the second edition but it has up to 4 volumes for the 1998 c/k. 2nd edition.
Correct, there are four volumes. And then there are two more volumes specific to the transmissions for a total of six, for this particular year. Another option is a subscription to GM Service Information (SI) at www.acdelcotds.com/subscriptions for just $20/3 days if you just need it temporarily.
@@DrShock awesome once again thank you so much I am so glad I came across your channel really appreciate your help and all the information you gave me.
At 19:17 the ground strap on the right going down . Where does that one go too?
That would be G110 shown earlier at 12:19 thru 13:05
Thanks I appreciate that
2001 silverado hd. Trying to figure out why when i turned the high beams on the low beams, quit, then after thinking i could just change the high beams to the outer holes in the lens i went in and started it clicked the high beams on and now all lights are out , the relay was tested good all fuses good, but when you try to turn the high beams off the light on the dash stays on for high beams and stays on when you click low beams , problem went from bad to worse, could this be a ground issue.
Unlikely as a ground is needed for it to light up at all. More of a wiring harness short or switch issue, you'll need to take the wiring circuit schematic for a 2001 head lamps path out of the service manual and trace thru that circuit. I would unplug the lamps to eliminate variables and just work thru it with a voltmeter that can do ohms and continuity tests.
@@DrShock i was thinking it might be right in the high beam dimmer switch in the column someone else was saying that too. Thanks
I did just find the main ground strap was totally rotted off, so i would imagine it could be a mess. as it is a plow truck in Michigan
You could test the switch to insure that's the problem before replacing it.
I wouldn't expect that to cause these symptoms, but definitely would replace it. I put info in the description on the GM strap part numbers.
Where Does The other End Of Of G110 go off of the frame? Thats Where Mine Is Cut off. Just Bought The Truck 2 days ago...1998 chevy silverado 5.7
There's a pinned comment at the top on that. G110 and G111 both attach to the same frame point as shown at 19:04 in the video. While G111 goes to the firewall underneath the heater hose inlets, G110 connects onto the back passenger side of a Vortec 5.7L engine as shown in 12:22 of the video.
@@DrShock Thank You
The Truck Starts and Runs, But What Do Theses 2 Ground? The one going to the back of my engine is ripped into.
These two are part of grounding the body, frame, and engine together. If one strap is damaged, I'd definitely suggest replacing it. This isn't the sort of ground that would prevent the engine from starting though. More the kind that would cause intermittent electrical glitches.
@@DrShock Could Be Why Its Turning over Slow or My Left Rear Brake and Turn signal dont Work
04:07 G404: Not Found 😂😅
We’re can i fined a service manual for a Chevy Tahoe 1999
Out of print, eBay would be the best spot. There's a link in the description for some years too.
Man, I have a digital copy of this manual, I wish you showed page numbers because it's 1700 pgs and you are flipping through all the pages I need and can't find. It takes a hella long time to scroll from the ToC out to chapter 8 if that's even where these diagrams are
If you have the genuine GM service information (SI), then it will be in the wiring systems section 8.
@@DrShock Thanks, that's where I've been looking. I'm replacing my ground straps as they all seem to be broken under the hood anyway. The diagrams you pulled up were for the individual components(such as the underhood lighting) not for the ground straps themselves. I have the verbal discriptions, I'll just have to hunt for the broken remains in the vicinity to find the correct bolts.
350 V8 1993 GMC 4X4 GROUND LOCATION?
🤯HELP🤯 WHAT COLOR IS THE GROUND ON THE 98 CHEVY 3500 PASSENGER DOOR WINDOW AND POWER LOCK HARNESS?? I WANT TO CRY!!!
I have a wire unplugged on a 2003 5,3 Silverado and in the engine bay there's a wire unplugged for the o2 senser and I can't find where it hooks up
Showed all of them except the 454….
The gasoline engine ground numbers and general location are all the same, including for the Vortec 7.4L, other than one (G104). I do not have access to the 7.4L to live video unfortunately. For the 7.4L G103 and G104 both appear in front by the thermostat housing nuts (whereas G104 is on the rear cylinder head for other gasoline engines). And while G103 is in the same general location for the 7.4L, it has less eyelets attached, but I did highlight the service manual page for this G103 diff at 14:39. Check page 8-341 of the Volume 1 service manual for a diagram of the 7.4L front grounds G103 and G104.
I’m getting a code that says repair cylinder head ground wire 1999 gmc yukon , having problems of rpm not going past 2000rpm
Where's the passenger side ABS sensor ground? On a 2002 2500 hd 6.6 diesel truck
I would like to know why GM uses these flat copper ground straps, as they always get terrible corrosion and disintegrate? Why not use a plastic coated copper wire instead of these flat ground straps with no protective coating on them?
Both of my 99 Suburbans with the 5.7 have severe disintegration of these flat ground straps......very poor design.
But your showing your age ??? There aint no more books like that .. the junky Chinese computers illiminated books nowadays ??
GM still sells hardcopy service manuals, even for their latest 2023 models. Typically they are in print for around 10 years, and after that you have to hunt for used ones on eBay or at a car show.
2000 Chevy 3500, standard cab, 4x4, 6.5 diesel. Been looking for the lift pump ground. Lift pump lives under drivers door, on inner side of frame rail. Power and ground appears to run towards the engine compartment in the protective tubing. Someone said its G404. Any help is appreciated.
Both the lift pump (single fuel tank trucks) and balance pump (dual fuel tank trucks) use G404 as their ground with the 6.5L diesel engine option.
@@DrShock Ok, thanks.