How to test a relay and the relay circuit

[@hugoaguas1]

Educated homie. I felt like I learned more from this video alone than from 20 plus others I've watched about relays. Keep it up vato. God bless.

[@georgemenzies9258]

After looking at all those other people's videos, your videos Part 1 and 2 are the best and most helpful! You're a true auto repair professional. Thanks!!

[@CtRealityNews]

I happen to be a Mechanic more less retired do to traumatic brain injury. But wanted to say you are a very good instructor/Teacher. You really explain things well. Just wanted to tell you Keep up the good work and hope you have a Merry Christmas and a great new year

[@StacyTurner1969]

I love mechanics who share their expertise for people like me, learning through youtube post and some by watching someone without them knowing what I be doing. Some men hate for women to do mechanic work. Thank you for posting this video because I believe my fuel pump relay has to do with part of the reason my 95 isuzu trooper isn't getting fuel pressure. I sure hope it's not the regulator.

[@keighleyhome]

Both videos on relays have been really informative. Cleared up a lot of misconceptions for me! Thank you!

[@tysoncross1120]

You had me at, put the wire in the A-hole...very clear and concise video👍

[@KeithSWD]

Watched the "expert" relay tests before but they confused me more with all the long stories to tell. This video is so precise and packed with basics than more talk! Thanks for the precision, Homie!

[@randalallen5792]

Somebody went to school, good job, Hector you kept it simple enough for even simple minded peeps to learn, Asta.

[@tomnelson1516]

.k

[@larrybrower5541]

Some body stayed awake during class. Lol.

[@raullcalzadilla3541]

Very, very clear without any wasteful words or explanations. Even a guy like me can understand it. Thank you!

[@markratony7630]

Homie Hektor, I enjoyed your video on relay testing. I am not here to criticize in any way. You have taken something that in general is fairly complicated to most shadetree mechanics and explained it in a very understandable and clear manner. You didn't get into tons of detail that is not necessary yet you covered everything that is important. I am a new subscriber and look forward to watching more video's from you. Thank you for a job well done.

[@KrimsonApoLLo]

Dude, you're a boss. These videos have been helping me out with electrical TREMENDOUSLY.

[@8Steady]

Probably the best relays video I've seen, bc it's not just a "hack" on how to test them, but how to understand and test what's going on. Thanks!

[@brianpayne6109]

First time ever i used the like button. I’ve seen good videos. I probably shoukdve gave a 👍🏻. But never stopped what I was doing to do it. You earned this one. Great , patient understanding, all of it and informative with out the fluff of bs.

[@johnsmith-qr5el]

Finally someone who breaks it down to where you can understand it. Now my problem is finding a video about the issue of where you mention the p c m running to where the relay connects.

[@taj73]

Tip my hat off for you, this is one of the best video ever. You made it easy to understand. I'm looking forward to learn more from you.

[@amandaenriquez8917]

Thank you. You taught me more in this video and the last video All bout a relay, than either of the mechanics in my shop. Working on Vespas is similar and on a small engine scale. However the push to computer control everything has put a few more relays in the bikes and this video, you yourself are an extreme help. Thank you for these videos.

[@engineerokikiola5178]

You really did a great job sir

[@ferdinandaugustifson4424]

You obviously know ur shit, which can be refreshing, as not all who make videos do. Keep io the good work, your explanations are clear and concise without unnecessary rambling. Gotta dig it.

[@mike814031]

i love the way he explains it, definitely helps how he takes the time to explain things! i really appreciate that

[@mattywollaston3996]

Love ya work Hector, thanks heaps for sharing mate, this has to be one of the best presentations, and explanations of how to test these wily buggers I have ever seen. Cheers Legend 🤙🤙🤙🤙🤙🤙🤙🤙🤙🤙🤙

[@Klikklikboom0911]

Where the problem if you don’t get any power to that relay terminal??

[@juniors9699]

My boy hope you start making more good video like this one again with video you just save people lot of money

[@anadrol50]

Your Video Helped me out ALOT! with my 2006 Hyundai not starting after a cam shaft position sensor replacement turned out to be a blown Ignition fuse. I would have never known to look there if I had not watched this video it added alot of value to my toolbox. Keep them coming.

[@HomieHektor]

That’s what it’s about 🤝

[@izcoronel]

@2:10 you did not test for a good ground but to test if your test light is good because the negative terminal is absolutely a good ground i learned a lot from your channel and please continue sharing your expertise i thank you

[@jasonbyerly8617]

About to trouble shoot a dodge dart a/c system, you gave me some real information to start with. One of the sockets has a burn spot on it. I feel confident i can figure it out now with this detailed video. Thanks.

[@jeffnorman4228]

Hi Hektor, Great video. Having a fuel pump issue on my Land Rover Discovery 2 and think I have a problem with my inertia switch circuit. Got power into relay cavity but when did your ground test with from positive on battery with test light got nothing so not getting ground. Do you have any videos how to check the circuit.. thanks, Jeff N.

[@JuanRodriguez-cm1rx]

Thank you my Hermano for explaining it as simple as possible , thank you so much

[@HomieHektor]

That’s how I understand it 👊🏼

[@jhonprieto4972]

That is what exactly I was looking for , the driver side door of my 2003 suburban died and I needed to know where to start . Thx GREAT JOB

[@BG-xh5rb]

Great instruction. What should you beware of when checking relays not to "fry" a pcm?

[@robertlaufa2389]

Lessons very helpful and informative because I can start to check and confirm the basics and problem shooting of my car myself rather than awaiting help from someone. 👍👍👍

[@thams.3071]

You’re the best Hector very and easy to understand Thankyou homie

[@RRR4RP]

A new fan here 1st video and I’m hooked to the content again Thanks so much

[@enriqueleon5456]

Like you said man no one on youtube show as detailed like you did .. 👍

[@dmope22]

I watched this video twice. i but i need to watch it a few more time. I have a windshield washer motor with no power and I checked the fuse but don't know how to check the relay. hope I get it soon. thanks for this video. you rock. cheers

[@nicholasquintero1080]

Man these videos are so valuable... literally. You save hundreds if not thousands of dollars. Ty4 the effort!

[@wyattoneable]

Having an extra (known good) relay with the cover removed would be a great tool for troubleshooting. That's an awesome trick. A nice use of an amp meter too. Really good video Hektor.

[@HomieHektor]

wyattoneable Thanks again, this should help a lot of the new homies on the channel 😎

[@user-ty9lh9ze1d]

You can buy relays specifically for testing purposes. They have buttons that you push to test circuit. Very easy to use.

[@timothyyearwood1732]

You talk about bypass and frying,can you show?

[@cienegagarcia9417]

Thanks for one of the best simplest ways to learn

[@hcooper267]

Good video,my question is if I have power only in the low side where can by the problem? Thank you.

[@YourFajah]

Absolutely wonderful video.It was a great help to me and i'm sure to others who are experiencing like problems. Thank you very much.

[@JScottTalbert-Lawyer2Warrior]

excellent - i needed instructions on testing the relay circuit with test light or multimeter. very helpful. thanks.

[@MikeNeal-x8f]

I kinda have a question. I got a 2008 Pontiac Grand Prix you hook the battery up the lights flicker but there’s still no power to the starter.

[@iftikharqureshi654]

Both videos on relays are great. Very helpful to know how these work, and easy to check relay and the circuit👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍👍

[@georgeneata]

Hello, thanks for this video, really helpful! In my case: sometimes, the AC clutch does not engage. Clip over the battery positive, no ground signal on pin 87 (5) which comes from the AC clutch. From the schematics, there is only one connector between AC clutch and AC relay (no other controls). Any possible causes why sometimes there is no ground signal other than wiring issues? When the clutch is engaging, there is ground signal on pin 87, everything works well several minutes than compressor shuts off. Power is provided to pin 30 (3) each time. Thank you!

[@elizabethduenas3811]

Thank you for your info. Have a 3rd gen Prius fan one turns on , fan two don't turn on ? Check fan motors with battery and ok check relays ok, check continuity from fan connector to relays but only one pin have continuity ??? check cooling sensor is ok ..Please any suggestions ?

[@alejabdrosaucedo6001]

Thank you so much for this video it help me out.there is one relay they control the horn?

[@br2millionaire774]

Appreciate your information I learned a lot from there. I have a question I have a 2011 Mercedes C300 that's not raining anymore. I'm getting interior lights but the car won't start I checked all the fuses. And noticed that one fuse had water in there. And it was labeled engine control relay check to see if I have ground coming from there but when I connected to the positive I'm not getting no connection. Thanks if you can help me out

[@petewhittle2930]

Love this video same as the first one. I am new to this so bear with me. What meter do we need to test above 10amp circuits?

[@trevorawai2540]

Hi, If you don't have the power supply from the fuse or relay box what will you do??

[@kirkwilson7169]

Blessings bro that is the best I have ever watched, I had learned a lot Blessings.

[@jhuesmann]

So if you bridge the power terminals of the A/C relay, you should hear the A/C clutch engage (assuming good A/C fuse)? And if you can apply 12V directly to the clutch wire and get the clutch to engage, there's a problem in the control circuit somewhere?

[@bluesky6251]

Thank you so much Can we adjust the multimeter on 20 volt DC to check the two sides of the load I mean 30 and 87 ? Will the AC clutch will activate? Will the fuse of the multimeter burn? Or it will just read the voltage between 30 and 87 ? I WISH you answer my question Thank you so much

[@Shelbynixon]

I am wondering if this is how you'd test the starter relay as well? My 2012 Ford focus se has power but won't turn over. I do hear a clicking sound when I try to turn the car on but that's it. I'm unsure if it's the starter or just a connection issue. Thanks

[@odongohenry4863]

Absolutely simple and easy to understand. Make for me a video on a flasher relay

[@nickeyswart5892]

You are a star 👍🤟🤘✌️✊🤜🤛

[@johnperez6972]

Hey Hector great job unexplaining the relay circuits. On a Note 7 Hyundai Sonata my instrument panel is no longer lighting up cluster works RPMs and Miles I go but no lights please help me

[@jimsailors4934]

Hector......do you have a video of testing the Port where you insert the OBD1 scanner.....I'm not getting any codes when I plug in my scanner. I have a 92 f250 5.8 efi that's running rough and need to pull codes but not having any luck with the scanner. I tried the paper clip method too, to read codes from inside cab engine light display with no luck as well. Any help wil be greatly appreciated

[@scottt89]

if the light doesn't come on when touching a pin with the key on and you've already confirmed the fuses/relays are good. does that point to a bad gem module? having problems with the wipers on my 2000 mustang not turning on. replaced and checked just about everything. if I jump pin 3 and 5 with a paperclip where the intermittent relay goes the wipers turn on. power seats, windows, chimes, interior lights all work.

[@Spitfireseven]

Yup Dude!!! You are pretty cool. This is a great vid! You gotta watch it a few times but that's because this video is so information packed! Just great. Now I can jump my fuel pump!

[@khoanguyen-mj9rj]

Hi! I followed your instructions and tested the relay and fuse at the control box. I just replaced the new compressor, dryer, height, and low-pressure switch. But I do not know why the compressor has no power unless I use a clip to bypass at the low-pressure switch, take off the clip the compressor does not engage and the fan does not run. I also tried to replace a new RCM AND does not work at all. Please help. Thank you.

[@jesusojeda6310]

Another one. You deserve loads of money

[@ronbenedict7395]

Awesome tutorial. Love your videos.

[@terryweatherman4667]

Thank you for that testing a relays help me understand a lot. Couple questions first can a relay test bad and then appeared to have a stuck open circuit. I connected a 9-volt battery to it and you started opening and closing for me?.. also what's the best way to check my what's the best way to check my onboard computers. ECM Exedra Thank you

[@motomom8ify]

My right front headlight is out, all lights are out except the amber parking strip on top its the only light working. I've eliminated it being the headlight bulbs or the fuses, so I took the whole headlight assembly out and hooked it up to the left side connectors and a couple lights came on when I did that but still missing the low and high beam. I tested the connectors that plug into the light and they are getting power. What do you think it could be? Ive been working on this for 2 weeks only driving my car during the day since I only have one head light. What do you think it could be, please help me figure it out....... 🙏 Love your videos you make it easy for women to even follow along so thank you for that.

[@tabithafisher3463]

Very clear and informative video... the info on relays finally 'clicked'. Question : I jumped my BMW and now it cranks and won't start and my check engine light is no longer working at all.... I could really use your insight on what might have been damaged. My car is a BMW 530i 1995.Thank you.

[@tabithafisher3463]

Yes I'm thinking that may be what happened. Upon further inspection (was under the hood checking my fuses and relays) noticed that a few of the wires connected to the DME were fried. Looked like they had gotten toooooooooo hot. Hoping you want to go over your technique for sautering wires together in your next video. In tips would be much appreciated...I really don't have the money right now to replace the darn thing. Thanks so much.

[@tabithafisher3463]

Update on my BMW...I was able to separate and splice the melted wires. Got the car running again. Thanks again for this video it really helped me on my search to figure out the issue with my car.

[@LuisMartinez-fr9gq]

Hello friend, can you help me, i have exact the same problem i was doing the jumper wire and now my car only cranks slow but it won't start, my car is 2001 Hyundai Santa Fe, how did you fix your problem i have been trying to figure out.

[@garyangulo9456]

What if you put the paper clip or jump wire and still not kickin in the cooling fan and already the cooling fan was working when I jump it , fuse was good too ! what is the problem is it wiring fault or is there another fuse inside the car for the cooling fan?

[@traciestanford7196]

When testing relay and circuits ,where does the B circuit come in.?in my case I have a brake switch circuit b low .not sure where to go to check as anti lock is displayed along with service engine soon. Help l,your video was very helpful as my ac isn't blowing .so I'm ready to figure this out, thank you oh itsa 96 chevy astro.thank you.

[@marvindouglas327]

How does it governs the off and on of the compressor clutch. My clutch will engage when switch on, but when it disengage takes over ten minutes to turn back on. I'm good with the temperature ( 46 degrees ) when clutch is working or engage but cab gets mighty hot waiting for clutch to kick back in. checked the relay it's good pass both test. could it be maybe the relay is overheating and not working properly? but i have switch other relays to it's position and still same effect.

[@gsrjaycee4521]

Not sure if that circuit shorted on the ecu or just the fuse/relay housing on drivers dashboard where I removed it or the fuse box under the hood??

[@pandilla209]

Great info. Hector. I have a question. My 2003 Chevy Silverado 1500 has a parasitic draw. I'm mechanically Inclined bro. I checked all the fuses while having a multimeter connected to the negative battery post and terminal. The the amp draw is about 60 milliamps. When I disconnect the the instrument cluster it goes down to about .20 amps. Is there a relay or fuse I'm not seeing? Thank you

[@lmterickg]

Getting negative 14 amps from the fuel pump relay when I jump with multimeter technique. I don’t hear the fuel pump turn on either. Trying to diagnose a crank but no spark/no fuel issue

[@ilsemorales4955]

Great video! What would need to be done if there is not a steady ground in one of the ground pins? I have an oem hid headlight that is not lighting up at times. Usually lights up in the beginning but turns off after a while. Switched ballast, bulbs, and even connected the opposite headlight to other side but the problem remained on the passenger side. Checked the hid relay for current, 2 power & 1 ground sends a steady light signal but 1 ground flickers on & off. Will it be a hard fix or should just take it to the dealer?😩

[@HomieHektor]

Ilse Morales what kind of car are we talking about?

[@ilsemorales4955]

2016 Chrysler 300s

[@tommyboyreckids]

about to test S/P relay now and and on this car which is odd the relays are 4 pins but can be install either way. Not sure if i reverse it mistake first time so i bought new relays.

[@marcos42953]

Maybe you can help me. I check the fuel pump relay hole (86, 87, 85 and 30) the only one I get reading is from 86 good voltage. all the others 0 reading. what you think that can be my problem? my pump or my pcm or both

[@HomieHektor]

What kind of vehicle? You should have two powers, one AT ALL TIMES and one with the KEY ON, 2 grounds, one AT ALL TIMES, and one control from the pcm, a switch, or other input signal. Use a test light not a voltmeter.

[@kalenm3616]

Yes thank you great job at clarifying steps to a easy lesson learned your video has helped me thank u

[@robertharris7627]

Very good video, Hector. Thanks.

[@TammyRdNkBrbiHall-Revis]

2015 Nissan versa has unserviceable relays in fuse linkage box. Can you bypass fuel pump relay

[@samkitty5894]

So if I don't have power on the control side pin I can assume that the switch that controls it or the ignition switch is bad?

[@garypederson7155]

Very good Video. QUESTION? How to test a Relay for Parasitic Drain. Would love a video on this. I've checked all my fuses and they are good but I'm getting a drain.

[@paulabrewer1101]

Man you're the bomb . I actually think I can do this watching your videos.

[@HomieHektor]

paula brewer you got this 🤙🏼

[@nashehanes1044]

No way, you're a girl!

[@Julian-zy1em]

Awesome video!!!. Having problems with my car, gonna use your videos to diagnose.

[@brucekirkendoll3637]

Hey Hektor on mymy 02 mercedes I do have two power sources #87 and 85 power is not traveling to #30 are the 40A fuse #32 i"m dropping power some where. I'm open to suggestions. I have already replace the SCR still have the same problem.

[@raphaelsargeant7034]

What if there's No ground on pin 📍 87 ???

[@chrisnagel9499]

How's that work for the engine control fuse on a 96 dodge ram 1500 4x4?

[@ahmodahmed1453]

Again you hit the target for showing how to test relays and relay's box, well comprehension . thumb up all the well Homie Hektor.

[@Gh0stInTheMachines81]

I have a question. I have a fusible link next to my fuse box with three relays in it, including my multiport fuel injection relay. If either of the other two relays were bad, could it create enough resistance to affect the other systems, like my fuel system which is controlled by the MFI?

[@stspringer2003]

Nice Video. Will an incandescent test light 154ma activate the positive control side of a starter relay that is plugged into a relay jumper?

[@kevinortega7810]

Hey hector....i got an 2005 vue v6 tensioner went bad and ate the belt.. I replaced the belt and tried using a jump box ro startcar and the the starter threw sparks and batt cables got hot.. Replaced the the starter and the poaitve cables... All it does is click and the cables get hot ..the starter kicks and spins on a bench test..could the alternator be shorted causing the hot wires and no start???... Computer still reads on the scanner

[@abelsaiz7164]

I know it has been awhile since this video, but here is a question. My auxiliary fan stage 1 relay ( low speed ) at the circuit has a very dim light from the test light with car off. My blower motor speed only works at high speed. With the car on, a/c on at low speed two pins shine bright with test light. Relay is good. Is this normal? Answers? Thanks.

[@stevenagosto3053]

Thank you for all your help and teachings!

[@MYMULTICHANNELS]

Hi. This is my second video I watched from YOU AND I'm glad I did. I will do some homework on my car about relay and I will be in touch. Another 5 STARS🔯✡✡✡✡.I will send you my inputs After I review this info.

[@samooel7]

Hello! Thanks for your informative videos! I have an issue with my toyota avensis 2004 headlights. They turn on automatically at night when the car is off and drain the battery so I have to take off the headlight relay (H-LP) every time I turn off the car. I am not sure that the relay is bad because the headlights can be turned on and off by the switch properly when the car is running. Could you please give me an advise as how to find the problem?

[@brucekirkendoll3637]

Hektor great video, I have a problem with my 02 s430 Mercedes. I pulled down a wire diagram from a good source online on my suspension pump circuit. it said the relay sw 87 was hot all the time upon checking it appears to be just that. i'm wondering what happen because I thought sw 30 was hot all the time. can you explain what may have happen, I can jump the two terminals 30 and 87 and the circuit works pump will run however i can't get it to run with the relay. I have tried several new relays. Bruce

[@angelc7984]

Putting a wire on the fog relay circuit would also turn the lights on too?bypassing it?

[@apolloorosco6852]

Would I still get voltage 11.6v if i had a bad fog light relay? The reason im asking is because the fog lights wont work but im getting a reading of 11.6v at the connector.. The lights are brand new LED's but both wont work even though i have voltage.

[@sarahrayas8003]

Awesome information thanks my next project

[@FranciscoMartinez-of3gr]

Does it matter if you had put the red lead on pin 30 and the black lead on the 87???? Or it doesn't matter.??? I am talking about when checking for amperage.

[@josephguzman5032]

I have a 2003 Mitsubishi Diamante, l have a problem with the transmission,check engine came on ,the neutral position light is blinking, and transmission is taking off in 2nd gear, went to Auto Zone ,had it scanned and came up with code P1751and with there diagnosis,it was recommending a transmission control relay, I was wanting to no where it's located and also want to no whats the symbol on the fuse box diagram cover for the transmission relay ?

[@robertmullen2480]

excellent video, really well explained , one of best relay videos I have seen, thanks Homie , subscribed and look forward to more of your videos you seem like really nice guy and good mechanic!

[@jerryhood2799]

My nnñ me just uuyy you u it

[@keep1treal61]

Can I do the same with Ford Explorer ac clutch relay? PIN numbers are different. They read single digits instead of double. The pins look different too they’re all parallel to each other

[@rabar537]

Thanks for sharing, you are a great teacher, the best yet! You don't "BS".

[@tonyc6454]

Hi Hector good job. I have a 2011 ford edge. My passenger side tail light isn't working. I've checked and replaced the bulbs. I've checked for voltage. its good. any thoughts? Tomorrow i'm going to get some more bulbs and try that. Thanks Tony