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.

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.

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

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.

These Tech Tuesday’s are the BEST. Relays always challenge me a bit. Thank you for this Doug!

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 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!

Nice video! I just finished my first relay project. I'm using two SPDT relays to turn off auxiliary power on my Dual Revolution lights when the turn signals flash. One controls the lights on the left and one for the right, they are wired as NC, and they are triggered by voltage going to the turn signal to cut the green light and allow them to be amber/red when the turn signal is illuminated and go back to green between blinks. It was fun to do, it's definitely an attention getter, and I was proud to get my idea completed, but I'm going to change it up slightly and add a strobe controller now.

this was VERY helpful, wiring can be very intimidating and this made a big chunk of it make sense. thanks guys!

After many years of learning and using relays wrong. This video made everything very clear.

such an underrated channel! thank you for that, very nice!

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.

Great info... the MSD 7564 solid state relays are great compact and easy to wire. 4 in 1 relay

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!

finally really understand relays!!! Thanks for the explanation for us simple folks!! You got my sub!!

awesome video and explanation of how to properly use relays to cure voltage drop problems. Thank you!!!

Thanks for a nice, straight-forward video, Doug.

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!

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

Thanks very much mate, explanations were great, you have helped me understand how to wire my project, greatly appreciated. Ken from Australia.

Very good and informative. I now truly understand how relay works.Thank you

Your best tech tip Tuesday thx 🙏🏻 so much.

Who has the guts to even dislike this video? Man those tips are the best thanks motion raceworks

excellent video thanks. you guys are helping me build my car.

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.

Great knowledge for the enthusiasts, Thank you.

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.

12 volt ninja! Great info guys

Thank you for the knowledge simplification.

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.

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.

Awesome educational video. Really well explained.

Very good lecture. I really appreciate the info that you shared. Thank you so much.

Great video. Appreciated the discussion and the appropriate uses for it.

Another good video thanks 👍

This is going to help me big time on my 1969 Nova.

That was really a good explanation of what I wanted to do. Thanks

??????? WHERE ARE THE LINKS YOU SAID YOU WOULD ADD. ??????

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

verry helpful info about relays now i can wire up this electric fan correctly .... thanks bro

Thank u finally got the answer I was looking for

Good explanation Doug

you're the man! thanks

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?)

Great video, thanks

Explained vary well thank you your help was great 100%.

Love this video thank you!

Well done. Thank you so much.

Cool video very educational thank you

Great video. Thank you

Thanks for sharing this bro. You done Good

great explanation! thanks!

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.

excellent video!

Most Excellent!

Thank you for this. It is a great help. Learned a lot. If I run 2 fans is on relay enough?

Helped a lot

Great info good review

Great vid

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

Very informative 👍🏿👍🏿

Great vid.

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?

Awesome video man, Doug does a great job breaking it down Barney style for people like me🤣

Thanks clear defined video

Thank you!

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.

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 ???

Some things to take into consideration: Length of wire in a circuit includes + and -. Remember when calculating voltage drop. Design each circuit for 25% additional load over the fuse or circuit breaker rating. Avoid any high amperage equipment in the passenger area. I strongly recommend GXL or SXL crosslink polyethylene coated wires. Use IP67 rated enclosures for your components rather than that marine grade crap which offers little to no dust or moisture protection. Prewired relay sockets force you to use wires that are all the same colors which hinders repair. 87A is on DPDT relays. It is had never been used in SPDT relays. DPDT relays may be rare to you but they are not rare at all. Often used in interlock systems where you want to shut something off when another is switched on. Relays and be bought with a resister or diode on the coil circuit to protect electronics from surges. Micro relays can switch up to 40 amps and use the metric 280 configuration blades, terminals, and spacing. Amazing space savings can be achieved. High power relays are great for switching loads of 100 amps but, the safest way to wire the system is to go directly to the starter motor through a battery switch like a Cole-Hersey M750 and then take power from the starter for your system. This not only will keep maximum loads off of electronics but, will allow you to crank the engine without energizing anything else for compression checks, etc. I learned some hard lessons about automotive wiring in 50+ years since 1972 when I first got into drag racing. Got out of racing but have been in the industry one way or another my entire career in manufacturing and dealer support. Just retired last year so I actually have time to watch videos on the subject (I had no desire to "entertain" myself on off time with work related stuff). I thought your presentation was much better than most I watch. Obviously I don't totally agree but certainly enjoyed a video on the subject that didn't make me laugh. Anyway, I hope you are keeping up your good work as I see this post is four years old. I'll bet you have learned a lot since you posted this. I was learning new things even as I retired and I loved every minute of it. Did you know that 3M did a white paper on electrical tape flagging? I found it to be a good read, believe it or not. Checkout the 280 footprint stuff. It is actually very cost effective. You can pick out an IP rated enclosure that is an open grid. Then you can populate the enclosure with any 280 component like, fuses, relays, jumpers, etc. I used to make a 3.33" x 4.44" load center that contained 10 fuses (or circuit breakers), 5 relays at 30 amps, all of the seals, terminals, cavity plugs, brackets, with 10' wires for each input and output of the correct size if GXL wire for a total cost of $73.72. The finished product was IP67 rated and could be power washed. It took about 30 minutes to assemble on a normal day. If I didn't need all ten circuits, no problem. If I needed more I also had made up some two circuit relay block and five circuit fuse blocks in advance. Since I already knew what basic circuits I would be using regularly, most of the wire I used as function coded every 6" with its name and number. The additional price for that is included in the cost I gave. Be advised, there is a big learning curve involved with this method but, if you are going to be doing it for a living, your reputation is on the line with each and every thing you do so do it right. It will make the next major advancement that much easier.

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😮

I was under the impression runnig the solonoid closet ti the fuel pimp, fan etc was the best wat to go?

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?

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

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?

Thank you so much

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.

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.

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.

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?

Worth noting the electro magnetic coil contacts are interchangeable. 85 & 86, either can be ground or active

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?

87a works great for your home wire on your wiper blade motor

Some older cars have relatively low voltage in their system, hence, amperage running thorough the system. How would the relay be wired to maintain the amperage/voltage to a new-type distributor?

what is the part number for the relay

So my LED lights and Switch will be up front on my eBike handlebar and the relay +fuse and battery will be in the rear rack box. Is this bad? Is it more ideal to use a relay when your setup is: Relay+fuse+battery+lights closer and the switch with flimsy wire far away?

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.

I only watched because you do Cleetus content. Thanks for the Bald eagles

@motion raceworks official is it true pin 86 and 85 can be swapped and it will still work properly ?

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.

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

Can i run a physical switch on the 85 or 86 and why would you use a switch on one side or the other to complete the circuit?

If you have to pick to power 30 AMP device in a car, will you go with a relay or solid state relay ?

how many prone does ur switch have ?mine have 2 so do i connect to ground hot wire to 86?

My IAC sensor dont work whit my computer and i wonder if i can take this cabels to switch instead? Ore this a bad idé? I wonder what fuse you think works? The cabels are 0.75 and i think 7.5 Amps fuse?

I never found the links. However this is a great video

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.