How can I get my alternator to quit whining?

Tiny
VETTEDREAM72
  • MEMBER
  • 2007 GMC ENVOY
  • 89,000 MILES
I have replaced my alternator 3 times trying to get rid of the annoying whining sound. I have used original GMC alternator, after-market alternator and an "top of the line" alternator. They all whine. Does the manufacturers just not make good bindings for these alternators?
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Tuesday, April 17th, 2012 AT 11:38 AM

5 Replies

Tiny
MHPAUTOS
  • EXPERT
Check that the belt tension is correct, if it is a serpentine belt, the auto tensioner may be faulty and not tensioning the belt correctly.
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Tuesday, April 17th, 2012 AT 11:45 AM
Tiny
VETTEDREAM72
  • MEMBER
Brand new belt and tensioner. The tensioner is fine. Any other ideas?
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Tuesday, April 17th, 2012 AT 11:47 AM
Tiny
MHPAUTOS
  • EXPERT
Check all pulleys and belt alignment, does the alt noise increase with load, i.E, heater blower on and headlights on high?
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Tuesday, April 17th, 2012 AT 11:50 AM
Tiny
WRENCHTECH
  • EXPERT
Are we talking about an electrical whine that can be heard through the radio or a mechanical rumbling heard in the engine compartment?
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Tuesday, April 17th, 2012 AT 2:49 PM
Tiny
MAYNARDMAN
  • MEMBER
Check for broken or missing ground straps
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Sunday, May 6th, 2012 AT 3:44 PM

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