what kind of noise does an alternator make when its going out? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 04-22-2009
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what kind of noise does an alternator make when its going out?

theres an odd ticky/squeeky noise coming from under the hood. had it for a while. goes away when i get on the gas. just does it when idling...


idk if its the alternator, but something is making that noise.
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Old 04-22-2009
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if its your alt, the sound of your **** not cranking over in the morning eventually

i say get a tune up, if that dont fix it have em check your valves

otherwise, sure its not the infamous 4.0 timing chain rattle?
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Old 04-22-2009
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already at 25k miles?? idk..
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Old 04-22-2009
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AC compressor pulley?

or just a loose belt....
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Old 04-22-2009
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Originally Posted by TheStig88 View Post
AC compressor pulley?

or just a loose belt....
the compressor pulley might be it...

when i get under the truck, it seems to be coming from there, but its still hard to tell..
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Old 04-22-2009
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I think it has something to do with this.

https://www.ranger-forums.com/forum2...ad.php?t=83886


Two of my alts that I replaced made a squeaking sound. Well one of those was more of a squeal. I think I was told that that was the sound of the bearings going out or already out.
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Old 04-22-2009
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hmm ok

well, i guess its under warranty for a reason!
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Old 04-22-2009
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idler pulley?
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Old 04-22-2009
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I would check before you pulled it or anything. Just take the belt off and start spinning some pulleys.

If your trucks under warranty then yea just take it in and tell them to fix it. Screw doing the work your self. lol
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Old 04-22-2009
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i just had the same problem bro i found out that it was the idling pully its right next to the alt its like 25$ to fix
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Old 04-22-2009
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Didn't certain year Rangers/B's have a alternator recall or known issue?

I thought I read it here somewhere lately.
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Old 04-22-2009
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Originally Posted by sniper_101 View Post
Didn't certain year Rangers/B's have a alternator recall or known issue?

I thought I read it here somewhere lately.
for what years?
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Old 04-23-2009
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Quote:
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if its your alt, the sound of your **** not cranking over in the morning eventually

i say get a tune up, if that dont fix it have em check your valves

otherwise, sure its not the infamous 4.0 timing chain rattle?
i doubt its the timing chain rattle i just had mine replace and it only did it at 2500 rpms and up under acceleration i couldn't rev the engine to get it. Also its exactly what it sounds like a rattle not a ticking noise
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Old 04-23-2009
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Use the ancient Cherokee method of holding a wooden dowel against each accessory and putting your ear against the other end to isolate where the sound is coming. It's a poor man's stethoscope. Careful not to put the stick in the fan belt though.
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Old 04-23-2009
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+1 for idler pully. Alternators in my experience have the uncanny ability to just up and die with no warning...
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Old 04-23-2009
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okay well im almost sure its the ac compressor pulley

is this bad lol
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Old 04-24-2009
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Probably just your belt. If it's doing it at idle all the time and even while driving, thats what it is, cuz mine did that for like 8 months and I changed the belt today and it completely stopped.
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