Wiring a relay: How & Why You Should Use Them On Your Project Tech Tip Tuesday
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- Опубликовано: 27 апр 2020
- Whether you are building a cruiser, a racecar, or a bruiser. Using relays in your wiring can improve the performance of whatever component is wired to it (such as a fuel pump, a fan, water pump, and more) as well as make the wiring more robust, durable, and functional.
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![How To Test and Diagnose Relays and Wiring [4 & 5 Pin]](http://i.ytimg.com/vi/S-DwV0HLsE4/mqdefault.jpg)
This young man has his "stuff"laced up tight. He's good at what he does and doesn't mind teaching others who are not as well informed.
such an underrated channel! thank you for that, very nice!
The wire gauge vs. length is key. Previouslyr I didn't know that you can get away with a smaller gauge wire over a short distance. Those Derale fans come with small short wires - and people would think, 'I just match that gauge' to run the wire to where you need to go, but in my measuring I needed a larger gauge. Maybe why a lot of people complain of their electric fans not flowing enough or prematurely failing.
Your built in light location is awesome!
What gauge wire did you use on the derale fans?
@@BALLERXD24 8 gauge copper stranded wire. If you search the web for 12v wire gauge distance voltage drop - you can calculate the specs needed for your application.
8 Guage is large wire. Like for a starter. You mean a # 8 wire?
@@MichiganRay Sorry about that. Not sure why I typed 8. I ran 10 awg from the fans to the fan controller and battery junction. I like run 4 awg to my starter which I'm sure is overkill but I assume 200amps.
But yes, you can't trust anything on the internet these days. 😅
Literally the best video on this I've ever seen. Currently wiring my truck, already knew how to use and wire a relay, but this video was great.
??????? WHERE ARE THE LINKS YOU SAID YOU WOULD ADD. ??????
After many years of learning and using relays wrong. This video made everything very clear.
This young man clearly knows his stuff..It's always been a dark art to me, but this does shed some light on it..Thank you..UK
Ditto
Mate thank you, you are a legend. I have always get confused with relays but the way you explained it has now been implanted into my head and no longer have an issue. Champion! thanks again
These Tech Tuesday’s are the BEST. Relays always challenge me a bit. Thank you for this Doug!
Thank you for clearing up this issue for me Doug. I’ve been dreading a wiring problem for a little too long because the relays and wiring were pretty intimidating. But this clears up a lot of things for me.
Great info this is helping me as I'm building a engine harness from scratch, and I actually incorporated a relay fuse box on my harness. I added it for ecu, accessory and fuel pump.
BY FAR, BEST VIDEO YOU WILL FIND ON RELAYS--TYPE, FUNCTION AND WIRING!
Currently in the wiring struggle on our 1/4 scale tractor. I think I've got a good handle on relays, but figured I can always learn more. This video is great, thanks Doug.
Great info... the MSD 7564 solid state relays are great compact and easy to wire. 4 in 1 relay
Thanks for the great videos. Very informative. I could never understand what a relay was, but you explain it so well. I will use this relay for my fuel pump when I install my EFI while I consult your other videos.
Your best tech tip Tuesday thx 🙏🏻 so much.
this was VERY helpful, wiring can be very intimidating and this made a big chunk of it make sense. thanks guys!
I was working one with helping a friend who's a painter that said he is constantly blowing out his dual paint sprayer pumps. First thing I notice was his 100 ft extension cord 16 gauge & motors was so hot it would burn your hand😮
After buying the correct gauge extension cord 12 gauge he was good to go. He had a huge voyage drop. The lower your voltage goes the higher the amperes are the motor are toast😮
THANKS , ONE !!!!
NOT POSITIVE , but I think what you meant to say was the LOWER YOUR RESISTANCE , THE HIGHER CURRENT FLOW .... thicker Guage wire has less resistance and is more CONDUCTIVE ....also the extension cords probably don't want to be EXCESSIVELY LONG .... only what 's necessary ....
Who has the guts to even dislike this video? Man those tips are the best thanks motion raceworks
awesome video and explanation of how to properly use relays to cure voltage drop problems. Thank you!!!
Well put. I play with relays all the time. And I still learned something. Thanks...
Spot on! Get them relays as close as you can to whatever your powering up👍🏻
It’s definitely nice to have nice long pig tails for the relays my old relays had fuses in the power feed..
they do have 100amp relays that you can wiring in as key on or key off definitely I nice option 👍🏻👍🏻👍🏻
Really cool video. I'm just starting to do some wiring on my project and I'm not very sure how all this works as a whole. You explained many of the questions that I had to begin with. You did very well in explaining why as well as how. I appreciate you taking the time to put info out to people like me. Thanks again and have a great day. My project is a 406 sbc powered ranger should be fun!
Thanks for a nice, straight-forward video, Doug.
That all made great sense. You explained that well thank you. What happened to link to wire diagram?
Very good lecture. I really appreciate the info that you shared. Thank you so much.
finally really understand relays!!! Thanks for the explanation for us simple folks!! You got my sub!!
Another good video thanks 👍
Awesome educational video. Really well explained.
Thanks for the vid, very informative. Answered a few questions I had concerning wiring up a couple halogens on a pontoon build using relay a relay.
excellent video thanks. you guys are helping me build my car.
Thank you for the knowledge simplification.
Just to clarify what you said about PWM, it doesn't exactly give you different voltages but instead gives you different duties. So for instance it will continually cycle from +12V to 0V hundreds or thousands of times per second and based on the commanded duty (0-100%) will determine the split between how long the pulse width stays at +12V versus 0V for each cycle. I'm just using +12 & 0 as nominal voltages here but think of it as high & low voltage depending on the application.
Great knowledge for the enthusiasts, Thank you.
Great video, thanks
Good explanation Doug
Very good and informative. I now truly understand how relay works.Thank you
Great video. Appreciated the discussion and the appropriate uses for it.
**Plz plees help☆
How do i tie more length of wire to the short red/black+- stubs that come with the universal 12V electric pump ive bought? What gauge wire do they jineraly use? The two short wires coming with it are not long enough to connect to a 12 V auto battery i woud have placed a safer 8 to 10 feet from the tank. Trying to jrain out bad fuel-tainted gasoline from a 2000 pon-iak sunfire faster way than those dum flimzy hand pumps. Txs a million
Thanks very much mate, explanations were great, you have helped me understand how to wire my project, greatly appreciated. Ken from Australia.
12 volt ninja! Great info guys
Cool video very educational thank you
Great video. Thank you
This is going to help me big time on my 1969 Nova.
Love this video thank you!
That was really a good explanation of what I wanted to do. Thanks
Thanks for sharing this bro. You done Good
Awesome video man, Doug does a great job breaking it down Barney style for people like me🤣
😂 Thanks for watching!
@@MotionRaceworksOfficial How about adding the links and part #s you said you would?
Well done. Thank you so much.
excellent video!
great explanation! thanks!
Great info good review
Explained vary well thank you your help was great 100%.
Iv'e used the fifth pin on a 5 pin relay to trigger a warning on the dash for a car that had a remote battery cutoff switch. The cutoff switch would drain power if you didn't hit the remote switch to disconnect the battery. I put a flashing light on the dash so when you turn the ign key off the light would flash telling you the battery is still connected and to hit the switch to disconnect the battery. But once you turned the ign key on the flashing light would go out. Was pretty cool to figure out a use for the fifth pin even if it was rare.
Thank you so much. This information would have solved the issue I had with supercharger m3.
The secondary pump wire kept getting hot, until it eventually made the connection fail multiple times. Looking back, it was 100% because of the thin gauge wire that was supplied in my kit.
I do miss that that high revving v8 sometimes, but it doesn’t hold a candle to the smiles per gallon I get with my manual hellcat.
Excellent Video, I needed a refresh on car wiring specifically my electric fan set up and FI system. Exactly what I needed for the next steps on my 1970 442 revival after sitting in my garage since 2005. Feel free to send donations lol
Thank u finally got the answer I was looking for
Very informative 👍🏿👍🏿
you're the man! thanks
Very good... Your explanation is the best so far. At first I was thinking your wrong about 16;02 . But as I got to listen to you more, ok,,, the other videos I was listening to are wrong. Yours is right.
verry helpful info about relays now i can wire up this electric fan correctly .... thanks bro
Thanks clear defined video
Thank you so much for explaining all these in details! I'm planning to make a fuel pump kill switch for my project car, and I was thinking about cutting off the power wire for the fuel pump to insert a kill switch. However, since you mentioned the voltage drop, I realized that increasing the length of the fuel pump wire might not be a good idea. I'll probably insert the kill switch in the wire that goes to 85 (probably the ignition switch?)
If you have a diode suppressed relay, you must ground pin 85 and hook power to pin 86 to energize the relay.
The relay I bought shows ground pin is 85 so I guess I have a diode suppressed relay. But what is a diode/what does it do?
@@cbd4734 diode is a means to unload the magnetic field in the relay coil. When power is disconected from the coil (control) then there is an inductive charge within that coil. If no diode is placed across the coil then you could have upwards of potentially 500v+. Not a big deal if straight to ground, but if the circuit is controled by a transistor/logic circuit then BOOOOOOM! Best practice is to use a diode. IN4001 is just fine between the +ve and -ve of the relay control coil. (Point the diode from -ve ->| +ve.)
Most Excellent!
The guy that wired a fan switch in my car needs to watch this. Melted the fucking thing!
I do industrial control engineering for a living and the turning point for me with relays was realizing they are just an electrically operated switch. In school we had always been told they were a way to control a large amount of current with a small amount of current, but that never made much sense. Once I figured out it was just a switch that you could open or close with electricity it got way easier.
SilentNight1647 exactly! It seems daunting til you realize that
Helped a lot
Great vid.
Thanks!
Thank you!
Great vid
Very informative...quick question. If I'm wiring three different set of LED lights would I need 3 relays. If so, would each of them have a wire going from the 30 relay connector to + battery. Please advise. Thx. Or is there a different way to do this.
Yo did a great breakdown of all that. It is my first time ever even this and feel like I now have a much greater understanding and appreciation for the relays job.
Than You
Good knowledge!
I'll probably buy a 40 amp relay with a pigtail to learn more how electronic specs work.
Thanks , you are awesome
But i always ask my self can i put voltage converter ( step down ) on 87 pin to make 12v step down to 6v form OEM car rear view camera ???
Thanks for the detailed videos, really helps. Btw my girlfriend has a 2014 Hyundai Accent Sedan in mint shape but her front bumper is cracked, thinking about buying plastic welding sticks. Any idea what the plastic type is, TPO? or PP?
what is the part number for the relay
Very nice. My question is if there is power leakage or unstable power coming from the switch Will the relay compensate for the voltage and amp fluctuation?
With standard automotive universal relays and with resistor protected relays, control side (pin 85 & pin 86) polarity doesn't matter. But with Diode protected relays control side polarity does matter, pin 86 must be the higher voltage side and pin 85 the lower voltage side. If the polarity is reversed the relay will short circuit the control side and damage the wiring, the relay, or both. It is a good practice to always wire the control side with pin 86 + and pin 85 -. That way in an emergency you can grab any type of relay, stick it in, and you will have a working circuit.
very well done video!! to clarify, you'd want to wire the relay close to the device you are powering? did i get that right?
I was under the impression runnig the solonoid closet ti the fuel pimp, fan etc was the best wat to go?
In my old muscle car at night when I would hit the brake I had voltage drop. since the wiring harness was good but it was outdated. I put relays on the back brake lights, headlights, dash lights. I also grounded the back brake lights, running lights, headlights with a heavier ground and additional ground. With relays I could cut the back brake lights off or on, tail lights off or on, and run the high beam and low beam both on at the same time for additional light since I was putting relays on everything. And hitting the brake pedal at night with everything going no voltage drop at all on gauge. Can stop the car in the road at night with no one seeing that the brake lights are on with the brake lights cut off and do a nice burnout or could street race.
Thank you so much
It would help also if you could mention the recommended wire cross sectional area to amperage usage so guys use the correct wire gauge.
Always use the same size wire if not 2 gauge sizes bigger, depending on your applications and distance between the relay and the battery..... d/c and a/c currents only have one thing in common, they both flow outside the wire not through it.... but thats a different story for a different time..... just like anything, resistance in an electrical system is bad there has to be some sort of balance..... the better the balance the less heat you are gonna generate the more resistance you have the more heat you tend to generate...... so much that, like he says in the video, eventually the wires can't feed or hold the capacity of said or required voltage, either blowing the fuse or causing a fire from melt down of an overloaded circuit..... also, the same goes for grounding situations..... one of the most commonly overlooked things is grounds...... the shorter and bigger the ground, the better and more solid connection will be for your systems..... one thing I've always believed in personally for my own self is always run a ground cable one or three sizes bigger that your positive leads that is required for your system if there's not a place to ground to in a short amount of distance...... last but not least..... soldering is a must for any high-end electrical system the less connections in the circuit the better and less resistance you will have..... in some instances if you wanna use crimp connections.... dont... those are for lazy people that do shit half assed or in emergency situations just to get themselves going in a pinch..... not mention they look like shit......or sometimes its the only thing folks have to get things done..... sometimes beggers cant be choosers..... remember the rules.....measure twice cut once.... do everything right the first time so you ain't sitting on the side of the road at 3am wishing you done it right from the beginning...... 😉 🤙✌
So on a 5 pin, is the center used to run a second component? Is it always on or does it turn off when the main one turns on?
12:50 thanks! 21:20 Nice Dog
87a works great for your home wire on your wiper blade motor
Has anyone been able to find the links he was talking about adding to the comments
Nope. I looked too. No link that I can find. He said he was going to add part #s too. They aren't hear either. I've found that is extremely common for RUclipsrs to say that they are putting info in the description and not do it. Very frustrating
You have to push "more" in the description, and in this video you have to push it again. Forget it. They are not there.
They’re there.
Well, I subscribed because you seem to be an electrical Professor. Thanks for info. ? Can you tell me if a wire is ran from relay slot to inside fuse box to enable car to start? It was sold like this.
Love this video watched it a few months ago getting up to speed planning, now I have holley efi tank in, engine and trans in and starting with running all the fuel lines and wires ect.... I still dont know the best way to run the efi fuel lines past rear axle on my 70 gm abody 442 just looked at it tonight and factory line placements wont work..but car hasnt run since 05 and getting closer most every day
**Plz plees help☆
How do i tie more length of wire to the short red/black+- stubs that come with the universal 12V electric pump ive bought? What gauge wire do they jineraly use? The two short wires coming with it are not long enough to connect to a 12 V auto battery i woud have placed a safer 8 to 10 feet from the tank. Trying to jrain out bad fuel-tainted gasoline from a 2000 pon-iak sunfire faster way than those dum flimzy hand pumps
Relays are simple. I always do them this way 85 = trigger input. 86 = is the opposite of what you are using as a trigger. 87 = should be what you want as your output. 30 = your output. 85 and 86 are interchangeable, you can use 86 as your input trigger you will need to use the opposite on 85. If your trigger is negative (ground) then you will apply 12v to 86 (or 85 if you used 86 as your input). If you are needing 12V out of the relay (pin 30) then you will apply a FUSED 12v source on 87. SO if you have a negative input (85) and you want 12v out of the relay(30), then you would put a FUSED 12V on both 86 and 87.
Where are the links? Great video but was disappointed at the end when I went to look for the links you spoke about..
Me too. Very frustrating.
I have a question, I did not see you mention a Spike Diode in there, is not necessary? Thanks..
Can you explain how to wire this relay into the starting system? Bought a 66’ mustang that had this installed and removed it. They used the neutral safety switch wiring and the S terminal wiring for the starter solenoid.
Link to the diagram you spoke of?
Just type "4-5 pin relay schematic" in your favorite search engine
@@laneeric Good info but that's not the link or part #'s they promised.
@@ToddKing If you can't decipher a simple 4 or 5 pin relay then maybe electrical wiring isn't for you. It's very simple.
So I have a c10 where I threw a lm7 in and I have now bought a cpp tank they don’t give u instructions on how to wire there fuel pump it came with a walbro intake pump to give me 60 psi I got the relay you sell but I need to know what is a good 12 volt switch to wire it to I got gauges wired to my light switch so where should I go from there also do I have to run a inline fuse this is my first time wiring
@motion raceworks official is it true pin 86 and 85 can be swapped and it will still work properly ?
Just saw this nice information. Question! PWM signal. I have an Edelbrock Pro-Flo4. It has a fuel pump double lead. A negative and positive feed that plugs into a remote fuel cell that Edelbrock makes. Now, this can be used to trigger a relay. I fallow the schematic it triggers by the negative wire. The ecu has a PWM that can be turned on and off. How can this be wired up to a PWM fuel pump? The fuel pump has a 9 amp limit on it. Only #18 wire. Plus anything more is too much draw through the ecu.
So you run thick wire from your battery and use relays, will a single battery and alternator be enough to run two fans and extra fuel pump and water pump by itself?
So is the wire that is needed to be a larger gauge the red wire? This maybe why I’m not cooling. And is this wire the one from the relay to the battery?
What damage can be done by bypassing the relay and wiring directly two pins on the relay? My headlight high beam is not working, but if you bypass it, it's work.