1997 Chevy Cavalier alternator hum with engine off

1997 CHEVROLET CAVALIER
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PROSHOW
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Electrical problem
1997 Chevy Cavalier 4 cyl 111000 miles

hello, my cavalier's alternator makes a high pitched humming noise with the engine off. What could be the problem??? Thank you!
Dec 13, 2008 at 5:05 AM
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MMPRINCE4000
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Have the charging system tested at most autoparts stores for free, see if they can test for alternator "ripple", but most likely you will need to replace the alt.
Dec 15, 2008 at 7:13 AM