Low battery voltage

Tiny
WILLIAM DIAL
  • MEMBER
  • 1983 BUICK LESABRE
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 17,000 MILES
I have new alternator and battery but only have 12.6 at the battery with car running and when I idle the car up it starts taking the voltage down but can take the battery terminals completely off of the battery and the car stays running.
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Tuesday, February 4th, 2020 AT 6:42 AM

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

Removing the cables while running tests nothing. You most likely damaged the alternator by doing that.

I attached a wiring diagram for you. Make sure the 2 red wires have power in the on position. The other wire needs power as well.

Verify with a voltmeter.

Roy
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Tuesday, February 4th, 2020 AT 7:31 AM

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