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batchman · 10-01-2009

How many miles on the car?

I don't know GMs charging setup but my experience has been as you run up miles, alternator brushes will wear and give less output at idle/low rpm. A car with an idiot light will show this first as a low glow at idle. The last several I've had to worry about were at 120-150k miles or so.

The other popular alt failure is in regulation, which is often integrated into the alt, which will be a sudden total failure.

Good luck,
- Jeff

10-01-2009	#18
batchman Join Date: Jun 2009 Location: I live at Devens, one run at a time Posts: 454	Re: Alternator or Battery??? How many miles on the car? I don't know GMs charging setup but my experience has been as you run up miles, alternator brushes will wear and give less output at idle/low rpm. A car with an idiot light will show this first as a low glow at idle. The last several I've had to worry about were at 120-150k miles or so. The other popular alt failure is in regulation, which is often integrated into the alt, which will be a sudden total failure. Good luck, - Jeff