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Electrical

Tiny
WADEDAVID
  • MEMBER
  • 2000 CHEVROLET BLAZER
  • 170,000 MILES
With engine running my battery warning light illuminates and the voltage indicator drops to 9 instead of normal 14 and will stay this way for sometimes a few seconds to sometimes a few minutes and will then slowly rise back to normal and battery light goes off. I suspect a bad alternator but need further assistance because its erratic or intermittent. Thank you.
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Thursday, May 2nd, 2013 AT 6:19 AM

1 Reply

Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Symptoms indicates a failing alternator. The carbon brushes are worn resulting in intermittent contact.
When problem occurs, tap the alternator with a hammer and if the charging goes back to normal, that would confirm the alternator is bad.
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Thursday, May 2nd, 2013 AT 6:44 AM

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