How to Diagnose a Failed Relay In Your Car, Truck or SUV

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Learn how to diagnose a failed relay in this video! So, your horn won't honk, or your headlights won't light. You checked the fuses, and they look fine! What's going on? Time to check the relays! Watch this video to find out how a relay works, what can go wrong with one, and ways you can check yours to see if you need to replace it!
Check out our list of many other diagnostic videos!
• Driveway Diagnostics!
How To Use a Multimeter:
• How to Use a Multimete...
For More Info visit us at 1aau.to/h/b7z/
⚠ DISCLAIMER:
While 1A Auto strives to make the information provided in this video as accurate as possible, it makes no claims, promises, or guarantees about the accuracy, completeness or applicability of the content. No information contained in this video shall create any expressed or implied warranty or guarantee of any particular result. All do-it-yourself projects entail some risk. It is the sole responsibility of the viewer to assume this risk. 1A Auto is not responsible or liable for any loss damage (including, but not limited to, actual, consequential, or punitive), liability, claim, or any other injury or cause related to or resulting from any information posted in this video.

[@1AAuto]

√ *Watch the Video* √ *Buy The Part at 1A Auto* 1aau.to/m/Visit-1AAuto √ *Do it Yourself* √ *Save Money*

[@kevinsimmons2144]

Lmklll

[@kaptainkmann7808]

Is it possible for a relay for your turn signals and hazards to fail on three of the lights but still work on one. my passenger front works but it's the only one on both signal and haz. lights. 2004 GMC Canyon. scratching my head on this one any help would be great. frustration has set in LOL

[@siouxzee59]

My starter was bad but the mechanic replaced a switch commutateur interrupter, now my passenger side turn signal hyperflashes on the front, I have no turn signal on the rear. You can feel it in the relay switch located in my fuse box next to my dash. My starter was replaced, but why did they install a commutateur interrupter switch? And, why does the relay switch that they installed cause the hyperflash? Now, they tell me that they can install another switch that will cause the relay switch to stop the hyperflash. Personally, I think it's BS, why keep adding more switches?

[@abab201]

@@siouxzee59 lot of auto mechanics who are only in business to lie and cheat the customer; not all but the overwhelming majority

[@abab201]

@@siouxzee59 thank goodness for channels like 1AAuto and Scotty Kilmer who are out to help, not hurt

[@S92Chicken]

This is hands down one of the most informative channels for automotive!

[@1AAuto]

+S92Chicken Thanks for checking us out! 1AAuto.com

[@1AAuto]

+S92Chicken Thanks for checking us out! 1AAuto.com

[@mr.orim0782]

4 real

[@RicardoRodriguez-xm5yz]

And they have almost all vehicles too💯

[@Airmarty23]

Facts ❤

[@JCsaysSPAYNEUTERVOTEandMAKEART]

Best company ever. Sells the parts, shows you how! I've replace a ton of things on my car, including all window switches and all regulators. Thank you 1A!

[@buddyholly5246]

Without this channel my truck would live at the auto mechanic shop. That’s not including the thousands I would spend. Absolutely love this channel

[@SrnDpT-ti1xs]

LOVE the thorough explanation for how it works!!! Common sense explanations and down to earth testing for amateurs without expensive toys. LOVE LOVE LOVE IT

[@janeene24]

KZbin has saved me so much money on car repairs! 🙌🏾

[@jeffreydaley3730]

Excellent video & detail. Like the fact you demoed other methods of testing. Thanks.

[@pyrokamileon]

thank you very much for making this video! I tried reading a write up explaining how relays work and I wasn't grasping everything very well. but now that I have seen this video it all makes a lot more sense to me, it may be just that it's one of those things that you have to see in motion to understand better.. thanks again! 😀

[@TheMotorPsych]

Very well explained different methods of testing relays; really liked how you took the time to explain the workings too. Great for amateurs like me.Thanks!

[@lylachristopherson865]

LOL. BEST DESCRIPTION, EVER!! Thank you. Also, I loved the "Honk Animation". I watched it five times. You made little animated sound waves, and the relay actuator closed! Brilliant!

[@TENCUHTLI]

I really love the horn animation, that’s Disney level of creativity!

[@WalkOverHotCoal]

Thank you for your video. That would have to be one of the best for a novice like myself. Now I can diagnose electrical faults with more confidence. Great job sir.

[@1Azrattler4]

Your explanation on relays was awesome.

[@mymusic3354]

A relay tester.....This is the first video I've seen to bring this tool up into the discussion! Also very good explanation of how a relay works. A helpful and informative video! 👍

[@fieldsofomagh]

Very inclusive video of all the methods needed to diagnose a faulty relay.

[@ptyptypty3]

as usual... you videos are the BEST on the Internet!!! thank you!! :)

[@marcosoyao99]

Sir, your presentation really illuminated me in the subject matter. Thank you

[@pnweezy]

Very thorough and different ways testing the relay. Thank you 1A auto

[@annam3598]

The diagram made easy to understand how a relay works. Thank you!

[@SCESW]

Thank You so much for this video. It helped me sort out something that had been driving me crazy. Did not realize that inserting it backwards will 'randomly' break stuff.

[@bassdogg8551]

You made so simple to understand dude. Thanks so much.

[@jembo1959]

That has to be the best and so well explained video on how a relay can be either bad or good. Thanks so much for your great explanation. Top class.

[@alewis6451]

Thanks for explaining , showing, and testing the relay.

[@ruthspillman546]

Great info!!! I have a failure started w my drivers side door locks. Finally took entire down to nothing. So now I shall go out to check fuses and relays before I call anyone. Tks!!!

[@Mr.C.Cloud9]

Best auto repair video ever. Stumbled upon this trying to figure out why my Ford Focus high beams aren’t working but I hear a click! ✔️✔️✔️✔️✔️✔️✔️✔️✔️✔️✔️✔️

[@1AAuto]

+Mr. C. Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@pdnwaor]

Excellent. Very details on hand on example on how circuit works on relay. Thanks.

[@douwe4549]

simple explanation, well done, thank you!

[@7gooo]

Very Very Useful methods shown in this video >> Big thumb up for Andy & 1A Auto team

[@1AAuto]

+7Gooo Thanks for checking us out. Shop for high quality auto parts on 1AAuto.com: 1aau.to/m/Shop-1AAuto-c

[@Dhi-fe5eu]

Great video and demonstration. Learned a lot.

[@simpleinstants]

I enjoyed and learned a lot .THANK YOU for sharing it!

[@thegibsonserver]

Brilliant explanation. Thank you!

[@CoolHandLuke778]

I knew their had to be a way to test those. The Chevrolet dealership and stupid autozone said they can't test them! BS! Thank you! You saved me 50 bucks! My issue is my more expensive radiator fans..... but that 50 will go towards them. Thank you again.

[@ARM_DM]

Really good video. Both of my headlights went out. First thing I noticed was some corrosion on the battery clamps which I got rid of, and I made sure the fuses worked. I will be checking the relay after this. God I hope it's the relay, I do not want to deal with wiring harness. Also, do you think that a bad, maybe worn out battery clamp can cause the headlights to not turn on, even after car stars and all the other light work?

[@Mechanicsville804]

Best video on relays I’ve ever seen 👍

[@andrewbaker6615]

Nice and easy teaching even I can understand the video.

[@erichkestler1934]

Fantastic video! Thank you.

[@justwelltariang2456]

Exceptional explanation ,the way you explain is very cool and easy to understand.thanks.

[@harvrindrsingh]

Hi from Dubai. Thanks again for great information video

[@1AAuto]

+harvrindrsingh Thanks for checking us out. Shop for high quality auto parts on 1AAuto.com: 1aau.to/m/Shop-1AAuto-c

[@camilomartinez5382]

What a GOOD video. I learned SO much. Thank you.

[@1AAuto]

+Camilo Martinez Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@pk-fb2yr]

You made it easy.Thank you.

[@SuperLorenzogarcia]

Thanks for the info and all the great videos!

[@windycityben4850]

That was a really great explanation.

[@MyDadSmells]

I'm 16 and I got a broken down 1994 F-150 4.9 I6 and I'm trying to fix it. This video helped me, thank you

[@billylun9634]

Very informative. Appreciate your time and dedication .🙏

[@amybbartsch]

Awesome!!! Thanks so much for sharing.

[@bengiarraputo9357]

Thank you, great video. You are very smart, I could never do that, very clear, and calming voice. Well spoken .

[@gregrule3882]

Terrific tutorial. Thanks

[@kazibweivan9051]

Excellent video bro thanks a lot I have learnt it today and I hope am gonna work on my Van

[@2002erli]

This is a KICK-ASS Video- Thank you!

[@1AAuto]

+Erli Bittencourt Thanks for watching!

[@roccozarcone4393]

Great job enjoy watching your videos😊

[@skipskip3078]

that showing very interesting I'm looking for that tool now you had in your hand there's a master one I'm trying to find thank you very much have a nice day

[@waiting4aliens]

Fine simple understandable lesson. Thank you.

[@righteousman8488]

Thanks for the lesson

[@devoncampbell4039]

Awesome video 👍👍

[@Ratlins9]

Great informative video, thanks

[@kellyhatcher8802]

hell yeah you helped me solve a gremlin in my headlights that ford dealership couldnt figure out.

[@Marys-Channel]

Big Like 👍 Thanks for the education.

[@user-ry8tt4pj3f]

Very well explained..thumbs up

[@ramadorful]

Thank you for the video ! very well done thanks

[@notallowed33]

Awesome! Super good help! Thank you!

[@veronicastewart1959]

Where do you get the relay test box and the other part , are do they come together in a kit ? Are maybe the name of it I looked for a picture on y'all website but didn't see . Your video is great especially the way you explain and break it down . You definitely would make a great teacher in some High school or Technical school . Thank, you for sharing and teaching some tricks of the tread.

[@ThomasMcClaughry]

Excellent video

[@Dead-Goldstar]

Great video very informative 👍

[@chrishaan5766]

WOW! An explanation that I will remember Don’t you hate it when people make “HOW TO VIDEOS” And they don’t know how!!

[@georgeclouson2614]

Excellent job.

[@franzesherrera3386]

Thank you sir.. appreciate your help..

[@anthonyfisher4874]

Amazing video thank you!

[@Texazmane]

Great video

[@elektronik8875]

Greate explanation!!Very clear!!

[@1AAuto]

+Elektronik Thanks for the feedback!

[@Databyter]

Great thanks. I'm curious about how they came up with those off the wall circuit numbers, but that is a riddle for another day.

[@wagohowardmusic]

From the videos, I watched if you’re working on your ECM make sure your keys not in the ignition as it would start the car and you don’t want it to be and drive 7:00

[@PeterMojhar-wr7nd]

What if your High beam not working?

[@ahmedbamouh4936]

Thanks for the tip 👍👍👍👍

[@1998gst4611]

I like that relay tester that you use that tells you if the relay is good or bad. Where do i buy that relay test tool?

[@jaredmarcus1992]

Awesome Info! Wish you were my Tech.......

[@user-ng1bz4ln3p]

Good explanation Mr how to test a relay

[@luismonroyRealtor]

Thank you!

[@bobolbricht6331]

EXCELLENT DESCRIBSION

[@ChandraSQLVideos]

Fantastic video...

[@kaaraa-mardha1977]

You're knowledgeable and experienced,

[@1AAuto]

+Abdullahi Abdullahi Thank you! We love empowering our customers and showing how to perform DIY auto repairs with our high-quality auto parts. 1aau.to/m/Shop-1AAuto-c

[@earlbucklin8323]

Your are the best...... thanks.............

[@PhillyDee215]

Hey... can u use those Lisle tester relays as adapters for the relay buddy to test relays that don't fit on the relay buddy? I know the relay buddy has adapters for it but just wondering if the lisle tester relays like the ones u used would work as adapters in then just put whatever relay im testing on top of the tester relay

[@TyroneMaye]

Great video explaining how to test relay ...may i please get the link info to order the type relay tester you used here in the video ?

[@xxghostreapsxx6969]

What should I do if I have multiple relays that are good but still don't work it's on a 94 ranger if that helps I've tried everything and this was an awesome vid by the way👍👍

[@rustypotatos]

This is amazing thank you so much wooeowowoowow😊🎉🎉🎉🎉🎉🎉🎉

[@robertmedina3982]

Great job

[@theworldofqu4326]

THANK YOU SO MUCH!

[@AmitThakorlovemeorhateme]

Nice video

[@OldSchoolNoe]

Fantastic!

[@1AAuto]

+OldSchoolNoe Thanks for checking us out! 1aau.to/m/Shop-1AAuto-c

[@user-qz6rf6vc4y]

Thank you iam basing on vehicle electrical issues iam still learning in my school,can you please link me to where I can get your full technics in various parts of auto wiring.

[@heroknaderi]

Very helpful how much is a Relay tester

[@MikeMajdick714]

Good video bud

[@adassociates8235]

Great informative video, we had a 2020 Ford Transit Cargo 250 with a cigarette lighter socket blow, owner manual did not have any information of fuse location in it fuse boxes, we took to 2 different Ford Dealer, none of them figured it out, call 3 out of state Ford dealer to get help with no result , call Ford direct, they did not have that fuse location either ( just amazing how a lousy it is) Ford said take to dealership, but we already did , they couldn't locate the fuse to replace. At this point, we are look around to find a solution, any troubleshooting techniques that you can think of to track to that blow fuse that control the cigarette lighter? Many thanks in advance 🙏

[@crsrdash-840b5]

This is going to my learning about cars folder.

[@luisag.3719]

Very interesting video.. Thanks..

[@1AAuto]

+Luis Ag. Thanks for checking us out! 1AAuto.com

[@johnfranco5519]

well explained

[@hopefulton5670]

Good video

[@isulsten8379]

Very good Job. LIKE !

[@1AAuto]

+Isul Sten Thanks for checking us out! 1AAuto.com

[@rigobertochavezjr2026]

Great vid my gmc sierra 2000 tries to turn on ... But it can't catch ... We changed the fuel pump ... What else could it be ? I'm guessing the relay? It's on old truck but still runs good when it runs

[@jaimejay6056]

What if the relay is warm to the touch?