Diagnose Serpentine Belt Pulley Noise with a Power Probe IV

A friend has a new noise coming from under the hood. I think I recognize the sound, but I will use my power probe to quickly confirm it before we go get the parts from the junk yard and make the repair.

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[steveo]

Good video Tom. Yes, I have seen Scanner Danner do that as a way to know that you are not going to harm the engine computer. Just try to energize the relay with a test light by energizing the control side of the relay with the test light while the relay is mostly plugged in. Great job of demonstrating the safe way to do it.

[wyattoneable]

This was an excellent video Tom. It was well explained and yes, why not use the best tool at your disposal. Eric is a class act for sure.

[TheDisgruntledMechanic]

I bet if you could you would try to use that new power probe to change a tire! HAHA! Good vid and explanation. Thanks Tom.

[stuzman]

Great work Tom and you're right that with this heat, your buddy is going to need that compressor :)

[geraldfiorello]

Thanks for the great video it helped on how the probe can help also on how you can fry the different components. You and only one other person has showed that you can actually try other components.

[BuggysTowJam]

Awesome video! Very clear explanation! Thanks for taking the time to do this! Liked!

[scottpearsontoolsmore]

Great video thanks. Great explanation of what you are doing and how it works. Keep up the great work see you in the next video thanks again brother

[Greenmachine]

Manufacturers love this tool. It helps them sell ECUs.
I like the method of providing ground though. I'm not a big fan of forcing voltage into circuits, except in special cases.

[mikebonge]

that is really good, i wish my brain could wrap around what you are saying, , but it never has...

[SyberPrepper]

Another great video Tom. I may have a compressor (2001 Olds) to replace in my future so I'll be looking forward to the video about that. Thanks.

[jaimesustaita]

How ever that was a good vid, and explanation, ill add u on to my Arsenal

[ivansmith]

The PCM isn't going to ground that AC relay unless it sees the AC request signal So even if you send power to the ground side of the control part of the relay nothing will happen. If it is not grounded Then there is 12 volts present all the way to the PCM. Just look at the wiring diagram and send power to the right pin.

[philh]

wouldnt you have 12 volts at the pcm on the control wire for the relay until the pcm grounds it?

[enriquemartinez]

Thank you very much buddy good job I appreciate your time man and help over people like me there or not too much about cars I was wondering I had the same truck only this one is two downs in my eye need a diagram for the alternator I don’t have it I’ll wait to get it I was wonder if you can get one for me I appreciate it man if you can do it let me know how we can do this Let me know if you can if you have it and how you can send it to me I’ll send you my information let me know either way man thank you very much I found you on YouTube it was a good thing God bless you man My car is 2000 Automobile silhouette I need the alternator wire diagram thank you very much

[CRAZY_VIDS]

I would turn the beeping off so people can hear better.

[BruceLyeg]

Looks like the power probe is in good hands (I was gonna type PP is in good hands but that would be weird).
Gonna change the AC clutch or just use a shorter belt and skip the AC pulley?

[tubejim]

Great video. Would this be safe to do, if the ac was working?

[jaimesustaita]

But anyone could tell it was the clutch just by listening to, or at most mechanics should know!!

[Kevin-wykc]

3:00 i did that to a jeep shut the whole thing down 1000 dollar mistake

[adccars]

This should have a " Don't try this at home" message.