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1998 Pontiac Grand Am

Tiny
GULLYBIRD
  • MEMBER
  • 1998 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 13,305 MILES
My battery light come on I went to the gugarge and they told me its my alternator is bad I change three alternator and I still having the same problem so I want to know if their is a fuse for the alternator that blow and causing the problem
Tuesday, February 16th, 2010 AT 12:43 PM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Hi, make sure the battery has a full charge and the connections are good. Use a digital multimeter, with everything turned off, take a reading across the battery posts, the generic spec for a full charge is 12.6 volts. Then start the vehicle, take a second reading across the battery posts. If the system is charging, the second reading should be higher than the first. If the second reading isn't higher either the alternator is faulty or faulty wiring circuit to or from the alternator.

You can also take a reading at the alternator bat terminal, engine off and running. Compare.
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Tuesday, February 16th, 2010 AT 1:27 PM

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