Scratchy Sound maybe alternator? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-03-2014, 11:35 PM   #1
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Default Scratchy Sound maybe alternator?

My car is making a scratchy scraping noise only when in gear and i really get on the gas.. It doesnt make it in park or neutral when i give it gas.. Only in drive and im picking up speed.
Reason im thinking alternator is because my gauge us jumping from 13.2v down to 11.3v sometimes even 10.0v with 9.8v being the lowest.. Then jumps back up to 13.2. Am i thinkn rite or can it be something else?
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Old 06-04-2014, 05:43 AM   #2
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Wait until the car is cold, remove the serpentine belt, start it, and try to duplicate the noise. Remember, the belt is removed which = no power steering, no alternator and NO water pump. Make this a quick drive. But I'm going to guess your alternator is on its way out.
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Old 06-04-2014, 09:33 AM   #3
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Pull the alternator and take it into Autozone (or a similar store) to be tested.
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Old 06-04-2014, 10:01 AM   #4
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Alright im gonna try that, im gonna pull it and see
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Old 06-04-2014, 11:16 AM   #5
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Alternators, like ICM'*, sometimes don't fail when removed and tested...it'* better to test them on a hot car under a load....
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Old 06-04-2014, 08:22 PM   #6
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Quote:
Originally Posted by Tech II View Post
Alternators, like ICM'*, sometimes don't fail when removed and tested...it'* better to test them on a hot car under a load....
Which is why I suggested taking the serpentine belt off first.
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Old 06-05-2014, 06:49 PM   #7
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I went with wat u suggested Mike, and sure enuff it was the alternator! Got a new one on all quiet now..
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Old 06-06-2014, 06:35 PM   #8
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Thanks for updating us, glad you got it figured out and fixed!
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