HOW TO USE AN AUTOMOTIVE TEST LIGHT TO FIND PROBLEMS!!

This is a video tutorial on how to use a test light to help diagnose automotive electrical problems.

*Disclaimer: Please use all safety precautions

[kimb]

Thank you for your easy and quick video lesson. I just got my first tester today and had questions as to when to switch from the positive and negative cables of the battery - you answered them which I am so thankful for. Tomorrow is going to be a really fun day because with my light I can now go through all of the electrical and find out more about what is going on with my vehicle.

[kristinhess]

This is one of the clearest, most concise videos I have ever seen dealing with electrical diagnostics and general application of a simple tool. Thank you. Thank you for the information and thank you for not extending your video with filler. A A A A

[ncognitod.]

Thanks for this. Clear & concise. I especially like where you showed how to test for ground vs testing for power. This is info that will help me.

[bryanisensee]

I have no idea why you have 34 dislikes? It is the proper way to use it, Something seriously wrong with people in today’s world.

[jessgraves]

Thank you for fully explaining and defining everything. That was so informative. 🙂

[falconthree]

It’s old school, that why they don’t like it or understand it, this will saving u $$$$

[mrredpill]

I never showed do u test the fuses with key on or engine off?

[ardianasllani]

My abs pump clip isn’t working and I think I have a brake in the wires somewhere
Some if the pins light it up some don’t And i dont know if it means it’s good or bad

[grahamwatson]

Testing for ground like you say, connect the probe to positive, then where do I put the tip?
On the fuses, wires?
A bit more info would be helpful for a novice.

[Rob-oyhr]

I recently purchased a tester light and mine came with a red coloured clamp and I have seen other tester light models with a black coloured clamp.Why are the two different from each other? I understand that one is positive and one is negative just like a battery but don't understand why different makers make them this way?

[XPFTP]

also test lights may not let current thru. i found out after testing a small electric motor on my tractor. i knew was working. remove test lite run str8 wire and it was fine. even tho the light would light showing working condtion

[suspectr.i.pstoner]

how do you test out the fuses in the cat below the steering wheel where do you plug the fuse tester at??

[ampload]

Can I please get a link for a test light for testing a ICU I want to purchase on that is safe .thank you

[mnnomad]

Is that the same as a continuity tester? 💡

[breezy_codm]

Can u do a video on diagnosing a faulty light switch ?

[joecandoit]

Nice explanation with some good camera angles. It is worth noting that this is an incandescent bulb inside of the test light shown. If someone is probing a computer output that cannot source enough current, it can possibly damage the car's computer. Or if an airbag wire was probed, it could set off a airbag light, check engine light, or worse, could deploy the airbags. Use a test light with an LED or multi-meter if anyone has doubts!

[mightysaitama]

So, if the light turns on does it mean it is burned out or no? Im yet to figure that out.

[bryanisensee]

For those who don’t understand, this is not about what you can do with the Test Light, “it’s how to use it” there’s a big difference. Unfortunately, you’re on your own to figure it out on that, or you could always ask somebody.

[israelsanchez]

Can I use it for testing spark plugs ?

[jackog]

Ok question I’m trying to figure out my wiring issues for my 1990 GMC Sierra. It has headlights but all the other lights mainly on the back are acting weird for example with key on it has both blinkers front and back but when you turn headlights on nothing on the back works. I used test light on it with parks on and every spot on plug lit up even though I only had parks on. Then I saw this video and hooked my test light up to the ground on my battery and everything is lighting the tester up even if I touch my fender. I hooked up tester to positive side and it won’t light up on anything. I also did that test on my 97 GMC Sierra in which I’m having no problems at all and the test was the same. Any advise