Mechanics

HOW CAN I GET MY ALTERNATOR TO QUIT WHINING?

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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Vettedream72
April 17, 2012.




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.
AD

Mhpautos
Apr 17, 2012.
Brand new belt and tensioner. The tensioner is fine. Any other ideas?

Tiny
Vettedream72
Apr 17, 2012.
Check all pulleys and belt alignment, does the alt noise increase with load, i.E, heater blower on and headlights on high?

Mhpautos
Apr 17, 2012.
Are we talking about an electrical whine that can be heard through the radio or a mechanical rumbling heard in the engine compartment?

Wrenchtech
Apr 17, 2012.
Check for broken or missing ground straps

Tiny
Maynardman
May 6, 2012.

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