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Charging system failure light

Tiny
CHRIS SCOGIN SR.
  • MEMBER
  • 2005 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
The charging system failure warning is on. The car has to be jump started to crank but won't charge even though the gauge shows 14.5 V +/- while the engine is running. If I turn the engine off after driving for about 30 minutes and immediately try to restart it. It is already drained. When it's running and I disconnect the battery cable it stays running. I've checked the cables and connections. What could it be?
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Thursday, December 9th, 2021 AT 2:02 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

The gauge is not accurate at all. You need a voltmeter at the battery to confirm the voltage.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Never, ever take off a battery cable while the engine is running. If the alternator was a suspect, it is now bad. Then the engine will run until the voltage drops down as you need battery voltage for the alternator to work.

https://www.2carpros.com/articles/how-to-replace-an-alternator

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

Replace the alternator.

Roy
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Thursday, December 9th, 2021 AT 2:17 PM

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