How to Diagnose and Find a Short Circuit or Wire in Your Car

[@thejackofalltrades5171]

Millions of videos on KZbin about this. Been frantically watching many and end up confused as f$&k. This one was clear, to the point and made a hell of a lot of sense. Good job sir!

[@kiarnastoon6475]

I realised after I purchased my BA XR6 about 5 months ago that it had been....electrically r@ped. Excuse the phrase but there is literally no other way to describe the disgusting state of the wiring harness. Modifications had come and gone as people had purchased and sold the vehicle over time and 'easiest route possible' appears to have been taken with the install of EVERYTHING ...EVER. I have permanent scarring (lol) on my back from being upside down (Head in footwell, feet on headrest) followiing wires trying to decipher WHAT THE ACTUAL f people have done. My DTCs were changing daily...hourly even.. Now that 99 percent of the insanity has been repaired I only had 1 fault left to tackle and that was one I couldnt work out, a short to ground but wasnt blowing any fuses. After watching this video I now realise whats going on, its happening BEFORE the fusebox. Thank sweet baby Jesus for your great vid, you have saved me a great deal of time (which an auto electrician would have too, but I like doing things myself). Sub added, cheers.

[@DavidJackson-zc4eq]

Learned more here in ten mins than a whole lifetime of reading text books, electricity always goes the easiest route when under load, been scratching my head as to why i was getting volts but the circuit wouldn't work, now I know, thank you so much!

[@gaitamaemmanuel]

Am from Tanzania...mzee we ni hatari nakuelewa sana..whenever i enter into your class i never came out empty...🙌👍👍

[@samymabrouk4196]

I been on the floor as a Mechnaic for a long time and I tell you, you have something, I was missing and that is, good knowledge and concept for electrical systems, thanks for your help

[@doyouknowpeter1954]

i used to be frightened of the seeming complexeties of auto electrics but now i take it on as personal challenge to know all i can. you are a huge help and even an inspiration. thankyou.

[@Bcr3106]

This is the video i've been looking for. You obviously understand how electronics work versus some of the car guys who don't understand and just show how to do parasitic draw tests. Hopefully I can find my short now!

[@wardw1234]

Excellent video! I loved the simple electrical whiteboard drawings and your very clear and detailed explanations. Thank you!

[@lanceshroades6309]

I love your videos. You always show really helpful information. Please don’t use (or write) bad words. I really like my young boys to watch you stuff. Thanks

[@DangerousFreedom88]

As soon as one man seeks authority over another man, they have rejected freedom and it's very essence.

[@ojo2988]

Sorry, if your kids can decipher that.. then it's too late. They already know plenty of bad words.

[@wyattoneable]

Your very good at explaining things. The editing is flawless and I love the white board of knowledge. I'm good at mechanics but circuits still challenge me, this helps a lot buddy!

[@QuocNguyen-hu9vl]

I appreciated the way you show how to test a short circuit on continuity. But the approach seems for people already knew and experience what you have learned. If someone never test, experience and gain the knowledge that you does, that would be a challenge for them.

[@areyoutryingtosay]

Very rarely do I see videos that explain so well and in such detail. This is a great video, keep it up. Thanks

[@jarradhirschausen3553]

Pp

[@carlwallace3372]

Great video! Thank you for taking the time out of your day to do this tutorial. The cutaways to the white board and the comments/further explanation re: resistance in the circuits, as well as sharing what you have found to be the most common types of shorts, etc., was really helpful!

[@rone1523]

Yes, a great video but one thing you have wrong in your diagram. The switch is always on the positive side of the circuit not the negative and the fuse is always on the positive side other wise if there is a short it would burn up the positive wire/cable. The exception is a door jamb switch or some similar switch but that switch is just suppling the ground to complete the circuit in those cases. The fuse is usually located close to where the positive wire connects to the junction box/terminal/battery positive. The order of location in a circuit is 1-battery positive/ 2-fuse/ 3-switch/ 4-load circuit such as light bulb, motor, heat element, electronics, ect. This way you are always protecting everything downstream of the fuse in case of a short.

[@hanlercastillo2807]

It can’t be better explained as you did it, thank you for teaching

[@MasterChief-sl9ro]

Always make sure the right size fuse is in there as well. I had a lady go through 2 condenser fans on a dodge. Someone had a put a 15 amp where a 30 amp went. So as the fan hit high. It blew the fuse.

[@scottc3165]

This was very helpful. Thank you. I have shorts all over my daily drivers and am beginning to tackle them one by one.

[@domingohernandez4189]

you do a great job explaining things to me..... keep up the good work, your awesome!!!!!👍😎

[@angelacosta4567]

Domingo Hernandez outlook okk89 poo j&mkjuuuuu7

[@meganjay30]

That's exactly what I need to check on my car..... Got an O2 sensor problem and been trying to fix it for like over a year now..

[@vihreelinja4743]

HAving issues with p038 my self. had any success?

[@josephsfields]

I thought your pronunciation of "AC-compressor" was iconic until I heard you say "continuity". Enjoy your videos and whiteboard lessons. Keep up the good.

[@mikeneal12]

@5:24 "You're f****d" 😆🤣ROFL 😆🤣 I didn't see that one coming. Thanks for the excellent video!

[@jonrogers558]

I really appreciate your vid I forgot some of my diagnostic lessons and you reminded me of a lot thanks again!!! I'm Definitely a subscriber!

[@timochoa1]

Great video!!! I am helping my dad find a short in his 61 Chevy car. It does not really contain any negative wires to any of the things like tail lights interior lights or dashlights. Which are all out. (Since it keeps blowing a fuse). It simply uses the body of the vehicle as the ground. I can't find any breaks in any of the wires. Is it best to start checking each wire with one end on the body of the vehicle and the other end of the multimeter at the end light bulb wire? And repeat this for every light that is out? And make sure there is no Continuity, correct?

[@paulepling]

I'm wondering what's the best fuse to pull and test connector in the ECU box for 02 sensor faulty trouble codes, and if I could damage the box shaped fuses by pulling on them wrong. How do you check a gray box fuse, since they're not like other fuses u can see if they're blown

[@ases5004]

Very informative and hoping it will help me diagnose no interior lights on my Accord after changing all fuses. Thank you

[@tudocervera3764]

very well explained..thank you so much for helping out us garage mechanics..

[@JaidenStylezTV]

So how do we fix it. HELP! A live wire(12v) from my obd2 touched a ground and from the video I think I have a ( short to ground? ) fuse ketp popping then after 5 new fuses it stopped popping. But not my obd2, dome light, car remote wont lock or open doors are not working properly...

[@chatchatty2155]

very werll exsplained can you shed any light on why i have front lights on seat codoba but no back or fog lights coming on also do you no is the a relay fitted to light cercuit thanks

[@michaelbaskinmichael9862]

I have no turn signals or emergency flashers, was testing using a test light hooked it to flasher hot to do blue wire on turn signals. When this hooked up it starts to blink with test light hooked up. Why is that what's it saying it might need? Maybe ground or short to ground idk. Thanks enjoy your videos

[@luzcielmusica]

I have a question how about if there is no fuse blowout and no bad relay but the short to ground still there how to find 🤔

[@filitamayo]

I have batteries on my truck that get drained , no blown fuses or relays . But it seems that there is a parasitic draw.

[@Willywallass]

Great video. My issue is my airbag clock spring keeps shorting out. I’ve replaced it twice in the past year and it just shorted out again. No fuses are blown, but I know it’s bad because I have the exact same symptoms as before. Once I replace it they all go away until it stops working again? Any ideas on how to troubleshoot this would be greatly appreciated 🙏 Thank you

[@aaronmcdonald4944]

Thank you so much. I'll try this on my 2006 Scion TC tomorrow. My AM1 (Ignition/CIG/ACC) fuse keeps blowing and I'm trying to figure out why.

[@johnnyjohn8073]

The magnetic field you described as "ghost" voltage when wires in close proximities in the same harness become active from multiple components getting activated is a good mental visual for positive shorts.

[@dukedenarie5858]

Wow after 14 videos I found one with an actual instruction on how to test something

[@RanGer-498]

question I have a short that keeps blowing the fuse to my ODBII port in a 2005 Pontiac vibe ...if I change the fuse it will be OK for a few days (2-3) then the fuse will pop again, I do notice when this happens because the check engine light will turn on I found out it was the ODBII port when I tried to connect the odb2 diagnostic tool and realize it wasn't working...any help I'm stumped. ..thxs

[@TheMrFlyBoy18]

Going to do some diagnosing as to why my 15amp fuse keep blowng for my 2004 Nissan Xterra. Odometer lights, p,R,D lights are out and the same goes for the lights for the ac, fan speed and the direction of where the air travels to. Front, front and to your feet, etc. this helps narrow down my search. Will start doing this sometime this week

[@Aurora22586]

I have a turbo actuator that I am getting fault codes that it is shorted to positive. I assume the last time the engine came out to do the timing chain, some of the wires got damaged. That or the actuator itself is faulty: what is the best way to find out what is at fault in this scenario?

[@MarissaTheMuse]

Question. I have a 12v charger that has alligator terminal clips on which there is a small blade fuse on the positive side. I tried to use these clamps during a hurricane for a project and I blew that fuse. If I just bridge/put a paper clip in that fuse the charger works just fine. My question is is there anything wrong with doing this? Worst case scenario is the charger is killed during a surge right ? Idk what the fuse is for tbh…it might be to protect from electricity flowing the wrong way when the charger is connected to the car, but it’s only a 10a fuse so idk what it could really do, best I can tell it exists solely to detect current above 10a as a fail safe so when the fuse blows the charger stops working. Could you help me grasp what that fuse is for, and more importantly, what am I doing in this case when I use a wire or paper clip to bypass/jump a fuse receptacle ? Like what’s happening exactly and is there a safer way to bypass a fuse. Should I use the thickets and longest cable possible? Or a paper clip ? does the paper clip not only restore functionality but also act as a fuse because it will burn up if electricity flows through it??? So maybe I should use the thinnest cable/clip I have In this case now that I think of it as thicker would be like a higher rated fuse. How does that fuse inline with a cable in a car battery charger even work? Like for a 2amp charger ok fine I get it. But if you’re using a 10+ amp charger what’s the point of a 10amp fuse on the positive clamp???

[@BellaRocko]

You're an excellent mechanic/technician/teacher! And yes, it IS all clear now, thanks to you! Thank you for educating me and many others!

[@lalogarcia7172]

Hi I have a question. I have a 95 gmc jimmy 4.3l v6 with a vortec engine. I have been having some issues with rough idol. It also has been backfiring from in the Throttlebody . As well as from the exhaust an it’s been hesitant while accelerating an at driving seeds. I replaced the distributor cap and rotor as well as camshaft position sensor. Plugs an Warriors as well as ignition coil. I also replaced the crankshaft position sensor. In doing so I noticed. That the wire harness was old an wires had been arcane do to bare wires touching together. So I cut old wires an connecter an replaced it with new one. After doing that now my truck just turns over but doesn’t start. Also I to a look at my Fuses an the fuse to the ECM was blown. Replaced it with new one. An truck still won’t start. It ran before I replaced the wire harness an crankshaft position sensor. But now no start. If you help please. Thank you

[@inFALable]

You are a great instructor! Thanks

[@ja.935g67]

Got to love your sarcasm 😂

[@myRatchets]

Glad to hear, stay tuned for more.

[@defmud80]

How would I test a sensor connector to see if it has a break in the wire or a short? Its a 3 wire connector that goes to a input speed sensor to a transmission (2002 hyundai elantra AT)

[@abelvasquez7165]

Good video having issue with my Chevy silverado with a short on my starter!

[@gunnarjensen5910]

I had a small fire in the wires when the wiper/washer unit caught fire... I changed it but am wondering if these two problems are separete or connected ? The old wiper/washer unit only worked in one mode (max speed) The replacement works in all modes, slow, fast, int...The old one might have been dameged before it burned completely, un-insulated wire(s)..?

[@ciprianionutapetroaie7314]

One, I have a problem, I changed the wheel hub and rear abs sensor of my car and I have two light bulbs on the abs and ESP traction control board, and I found when I put the tester on my car it gave open circuit/short circuit to b+, right? what would this mean, what could it be

[@heroknaderi]

Thanks for thid video very informative.

[@danetted-r1525]

We have a 07 rondo and of late the back brake kept blowing the fuse, then the cyclops light stopped working and the mechanic just disconnected the cyclops light altogether so i could drive it. Now the rear windshield wiper stopped working, next the front windshield wiper defroster stopped working, the interior light does not come on, and just recently the rear defroster button started clicking when i turn it on do i quickly turn it off again as I’m afraid every fuse is going to blow. Its snow season here soon so wondering if you have any insight what may be causing all this. Also is the fuses near the driver door connected/different from relay under the hood. Thanks!

[@andrameda1]

Hello Rachet n wrenches, I have a Toyota corolla 2000, it is a no crank in park and crank in neutral not start in either park and neutral. The starter relay load side terminal lights up test light; control side does not light up test light however with meter a 3.44 voltage reading was discovered Key in ON position is this a short to power or ground side? When key in start the voltage is 12 .39 volts, on the control side of relay neutral safety switch is good shift selector good too, when in reverse or drive no voltage reading. Throttles sensor voltage is 1.30 volts open/close throttle no change; is the ecm seeing the low volt reference 3.44 on control side will not crank starter in park because it is not pulled down to oo ground, is it a shorted throttle sensor? Up date on voltage drop test battery positive to battery cable on starter with key in ON position remote switch pressed it dropped to 0.50 volts from 12.40 volts from battery. Negative battery to negative solenoid terminal key in ON position starter turning engine over slowly ground voltage drop 8.04 volts. Is this starter dead shot need a new starter? Peace, AL

[@chucklewis8640]

Very helpful video. One suggestion is to show exactly what pins on the headlamp connectors or headlight switch you are testing. In my case the taillights and the cluster light are out and there is one fuse that keeps blowing every time I turn on the headlights (low beam).

[@rogeryanez8107]

Nice video brother, Quick question will a bad bulb socket cause the fuse to blow? Thanks ✌

[@abdslil1054]

Thanks for your tuto i've Audi C6 won't crank, starter will engage if i jump wired and start the engine normally, but will not engage with its relay i replaced 4X relays but all the same, vcds says 50 short to ground, also 50 short to plus,?? i disconnected 50(+) that going to starter solenoid and short is gone, if i replace wire, short will back. So starter it self has continuing 50(+) to its body(-), is that normal?? if not i tested three 3X Audi used starter and has same continuing 50(+) to body(-), i got NUTS, PLEASE HELP...thanks in advance

[@bakernathan98]

How would I go about finding a short to voltage in a vehicle ? On my EGR plug there is voltage between the egr signal wire and both ground wires someone told me this means there is a short to voltage and that there should be no voltage between those wires. My error code is showing p0406 egr sensor circuit a high .

[@waen606]

Great demo 's and info ..thank you ..

[@mllobetc]

Can you explain how to diagnose a short to signal wire with a multimeter and not a test light? How to get round this ghost measurement you mention?

[@rightandleftish]

After re-connecting the negative wire to my car's battery there was a large spark and now I have a no crank no start situation. I thought I must've shorted the fuel pump relays (my car has 2) or the MFI relay because the pump doesn't' prime after reconnecting the battery and turning the key, but after bench testing all 3, they seem to be working just fine. Would the next thing to check be the wires going directly into the fuel pump? Any help would be appreciated - I am so lost and frustrated

[@7amood.alharthi]

Dear i have toyota land crousir 2004 4.7l and i have short in fuse ... when i replace the fuse direct short come again and its effect to window and ac control also fog light and release gear from P position i cannot release use the brack it shoud user manual release bottom near gear .???? What should i do ???

[@gachafans297]

I there a ground that goes to the alternator.i asking because I just put a motor in the truck and I am not getting any,but when I hook the battery up my headlights come on.vut no start.

[@laserfalcon]

I have a flasher fuse instantly blow soon as you turn on turn signals, where would you start?

[@theodoreholland7781]

You r good at teaching sir.

[@joelmenard8176]

So I checked the plug with multimeter. Plug has 3 slots. OL on both the green and red slots. The black slot shows a low reading? What does this mean. My fans can't coming on in the car. When giving direct power to the fans one works and one doesn't? They both have fan control modules. Wire harness is 3 slot power to fan from fan control is 2 slot?

[@TuthHurts911411]

Anyone know if a o2 sensor 4 wire having heater and sensor grounds swap would cause issue CEL light heating circuit low?

[@sidowsidow]

please do video on Power Circuit Probe Kit how it works and how to use short diag ... thank you!!!!!!!!!

[@josephr1868]

Hello sir my mom has a 08 malibu 3rd brake light and reverse light work sometimes but mostly not what do i look for or do?

[@nigelcharlton-wright1747]

Love the little drawing of the car in the wiring diagram, it looks like a '60's/'70's Hillman Hunter. Now I will have to check the wiring on my old car.

[@iammarauder5418]

If my lights flicker does it mean theres a short? My brake light and headlight on the left intermittently flickers.

[@sher12346weng]

Hello can you please help me. Recently i replace my o2 sensor because have check engine light and the code is p0141 so i replace it after a few minutes of driving engine light comes on again the error code is p0138 which is again in the o2 sensor. Whats is problem with that? Im hopping you can give me some ideas to diagnose it properly

[@gunnarjensen5910]

One wire from my cars (1986 Ford Econoliner 350XXL) headlight switch seemt to constantly overheat when the high beam is turned on... And after about 15 minutes the lights shut off... Can you advice.. I discovered one red wire was torn, and the relay made noises until I connected the wires and changed the fuse.. But still the high beam wire becomes super hot when using the high beam ??

[@rodneytoleno5148]

I have a 2014 Dodge Grand Caravan the radiator fan fuse keep blowing and I have no idea wat cussing it.. you think it’s the resistor ?

[@arturojimenez4382]

I added 4 LED strips to my truck and most of my dashboard lights went out. I tapped into the positive and negative cables for the power outlet & I used 2 displacement connectors one for + and one - .. could this have caused a shortage on my wires bc I checked all the fuses n they are all good, none of them are blown out.. and if I undo everything I did, will everything work find?

[@aakudev]

Exactly happened to my civic. Accidently had a short and now the igps oil fuse doesnt have power. Didnt blow the fuse and check engine light is on. How to check where is the short?

[@maroonloo126]

Might you be able to help in finding why my fuse keeps blowing whenever I make a left turn? Or hit a bump. Blown fuse indicated by battery indicator light...

[@cotystricklen7334]

Maybe water in the taillight or headlight or check your wires could have a raw spot in it

[@terrylear4219]

Might be an idea to clean your earthing body bolt.

[@yenzokilo455]

watching this in hopes to fix my car radio! a month or two ago my radio unit randomly stopped working. So i checked my fuse box and found my right side front headlight fuse is blown, upon trying to replace the fuse it immediately blew again. But my right headlight works just fine? Not sure how this is effecting the radio but damn i wish i knew someone like you in my city who could figure it out :/

[@jonnylopez159]

What if you have a fuse blown that has peace of coper wire on it does it effect the car in anyway

[@Raj-cf6fe]

When I tested the continuity of the park bulb socket, multi meter beeps when connected. Is that normal? I get my abs light on dash as soon as I switch the park and tail light on.

[@reynaldoclaveria100]

excellent explanation valuable video.

[@johangray344]

Hi for some reason my car does not want to start i drove it and then parked it and when i wanted to drive it again it did not start i found out that my fuel pump relay is not activating at all only when i open it and the press on the metal plate it the actives , also my injectors arent spraying fuel when you take them out and you test them they do spray what could this be?

[@treycee9444]

Hay how r u i have a 2006 Cadillac dts I try to start and it keeps blowing the transaxle ignition fuse I'm confused could you help

[@BourneThisWay]

So I had an interesting problem happen recently. I installed a new AC unit in my car and not even a day later, the circuit board in the AC unit had a hole burnt into it. I checked my AC fuses and relay and neither of them were blown. Does that mean that a problem occurred before the fuse box and relay box closest to the battery? The AC was also off when it happened.

[@leotorres777]

I have no power at ign-e fuse at fuse box under hood n truck (1997 chevy pick v-6 ) dose not start. i can jump it n starts right up. I chk the pins wear the 10 amp ign-e fuse gos n test light shows up green meaning ground but fuse not blown. How can i figure no power issue? Wouldnt fuse blow if its power n grounding?

[@commonconservative7551]

i was wondering if an ohm reading to body ground is normal ?....from the fuse connection to ground....i think my entire fuse box is messed up or a main wire with no fuse is grounded partly..maybe i will pull a fuse on my other car and see

[@stevemcgowan3017]

Fuse blew again on siren when replaced after clicked alarm fob but siren still works ?

[@smilerdon]

Every thing he's saying makes sence ,my issue is with my reverse light,I changed the bulb and still not working ,so I checked the fuse chamged the fuse and it blew straight away ,I did that 3 times , so where would I start checking

[@Cateran72]

I had a new radio put in, and all works well until I turn on headlights to vehicle... that's when my fuse to my stereo blows. Please tell me where to look and how to find the culprit

[@mk27texas]

Trying to find a short I’m my sons 2006 Corolla. Tail light/dash light fuse blows as soon as you turn the lights on. Replaced all bulbs and checked wires. Still can’t find the short??

[@Space_Nugget001]

im curious to know where is his shop located?

[@kidmystery2010]

I got a 2007 trailblazer thats blowing the acc and the lighter fuse but only when my wife's oxygen machine is plugged in. There are two separate fuses for these circuits. It only blows which ever its plugged into either acc or lighter. We ran the machine for months no problem at All now it blows the fuses. Phone chargers don't blow the fuses. We exchanged the machine for a new one still blows fuses. Im at a loss for what it could be. I've changed the sockets still blows em.

[@1776FreedomNow]

the two Links at the end of the video don't show electrical troubleshooting. you should post them down below in the description.

[@nickayivor8432]

KNOWLEDGEABLE Ratchets and Wrench 👍 for sharing it Take care and have a great day KNOWLEDGEABLE Ratchets and Wrench From Nick Ayivor from London England UK 🇬🇧

[@mannixbluevideos5986]

I short my car and my dome light,, door lock and heater is no power i check all the fuses they all good but the 10amp and 7.5amp didnt light up when i run a test light what is the problem with this,,

[@roadworthy6901]

Love the series, thanks!

[@myRatchets]

np, glad to hear. cheers

[@barryy2k94]

Hey.. i connected a 12 v day time running lights to both my car headlights about a month ago.. they were working just fine until yesterday they randomly went out.. (both headlight and DRLs). After a couple minutes checking all the fuses, i found two fuses which are blown (15 amps). after checking the owners manual, I've came to conclusion that they are connected to the highlights. I replaced the fuses with another 15 amp fuse and when i turned on the lights (engine was off). They suddenly went out, i replaced them once again and took off the DRLs and they went once again.. is it possible this might be a short circuit, or the switch is burnt out?

[@MasterChief-sl9ro]

Use a 30 amp cube relay. Use the headlight circuit as you source wire. Run a load wire off the battery with the proper fuse protection. As you are overloading or under volt the headlight circuit.

[@barryy2k94]

Master Chief 00117 thanks for the response.. ill try that and keep you posted

[@commonconservative7551]

rule of thumb to not screwing up and wasting your time is this ...never put anything on a car that the factory does not account for....that includes headers etc.......if u look at the pain in the ass problems they run into you will know what i mean....just don't do it

[@richmeister1175]

Thank you so much! GREAT VIDEO!!!!!!

[@Sewnami]

My car shorted out on me. I have a distributor leak and it went to alt then all that electricity went to my alt fuse and melted it. Replaces my alt and as well as the fuses. Ever since I did that, every time I turn the key my 7.5a ignition fuse blows when I turn it over. I ain’t got money to spend on a mechanic rn, anything would help.

[@jamest6391]

Awesome teaching!

[@Robonza]

An easy way to work on a short is put a light bulb across the fuse holder. When you work on the car you know you found the short when the light switches off.

[@myRatchets]

yes that works too, cheers.

[@nyokarenfroe8485]

Robonza 3:10 yellow bag of work

[@lebeckchris]

Can you explain in more detail please?

[@AnonX-jk3zu]

Yeah i would really like to have this explained in more detail please. Its just not making sense to me.

[@thegrudzer4102]

My all fuses are ok but battery is loosing 11 volt while checked with multimeter i tried the fuse trick scanner is showing headlamp circuit have a ground short

[@jessicariffle2097]

My 2006 explorer keeps blowing a fuse and burning up coil packs also. Have replaced 3 times. Guessing it's a ground somewhere. How do I find it if that's what it is. Need someone's help to put me in right direction

[@qamerkramet4562]

i have problem with short dcc circut..plz help me wht to do ???

[@anthonykennedy2980]

What is setting for multimeter?

[@badgoatnation1714]

so if my left driver side is dim would that be low amps and my fog light on the left side wont come on would that be a short or faulty wire

[@DaOzMan0608]

Can this same method be used to troubleshoot a circuit with a blown relay? My 94 Infiniti G20 won't engage the cooling fans. The fans for a FACT (hooked up directly to 12v) are working but the fans won't turn on automatically. Temp sensor and fan switch sensor have been replaced so I'm down to electrical wire issue. Only has 126k miles on the dash, she's still a young pup.

[@peterhenry2240]

Yep it can be used. I'm still learning myself, but just used this info to fix my car's horn. I removed the relay and used a piece of wire to 'jump' the relay/make a direct connection. Doing that should have sounded the horn but it didn't. So with the wire in place I followed the same test methods in the video and narrowed the problem down to no continuity between the horn's ground wire & the negative terminal of the battery.

[@Sroor90010]

@@peterhenry2240 Thanks that great some body told me this but Just now ive understand from your explanation Thanks man 👍👍👍