Question about 1997 Pontiac Sunfire

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Alternator wrrring sound

Replaced alternator with new one from Franklin Auto because bearings were bad causing a wrrring noise from under the hood. Problem is, most of the noise is gone, but not all. Unplug the field connector from new alternator with engine running and noise goes away. Otherwise it appears to be working ok maintaing battery at 14.3v. Any ideas? Should I return the alternator?

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  • don910 Dec 11, 2008

    Thanks for the reply. I revisited Franklin Auto and let them listen to the noise. They said the noise was coming from the engine and not the alternator, until I unplugged the field connector. They exchanged the alternator for another new one and the noise is gone. Charge voltages look good too.

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It could very well be a bad alternator id take it back and ask for a new one to try it

Posted on Dec 11, 2008

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