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Battery not charging

Tiny
HAUCKELEGH
  • MEMBER
  • 2002 GMC ENVOY
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 158,000 MILES
The Battery light is on. The car slowly shut off while I was driving home.
Wednesday, March 14th, 2018 AT 5:05 AM

6 Replies

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

Make sure the belt is turning the alternator.

The next step is to check the voltage at the back of the alternator. The most common failure is the alternator itself.

Do you have a voltmeter to do some checks?

Roy
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Wednesday, March 14th, 2018 AT 5:09 AM
Tiny
HAUCKELEGH
  • MEMBER
  • 2 POSTS
The belt will turn but it is very hard to make it move. Afraid I do not have a volt meter.
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Wednesday, March 14th, 2018 AT 5:31 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, can you get one? We need to check the voltage at the back of the alternator to verify its failure. You can rent one at a parts store.

Roy
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Wednesday, March 14th, 2018 AT 5:34 AM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
Very hard to make what move?
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Wednesday, March 14th, 2018 AT 7:44 AM
Tiny
HAUCKELEGH
  • MEMBER
  • 2 POSTS
The belt will turn but it is very hard to make it move.
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Wednesday, March 14th, 2018 AT 12:02 PM
Tiny
PATENTED_REPAIR_PRO
  • MECHANIC
  • 1,853 POSTS
Are you trying to move the belt by hand?
If you have the key on run, the alternator will be live and difficult if not impossible to turn.
I think what asemaster meant was just to look at the belt while the engine was running and make sure the alternator is spinning.
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Wednesday, March 14th, 2018 AT 3:17 PM

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