1999 GMC Sierra Battery/Alternator

1999 GMC SIERRA
180,000 MILES • 5.3L • V8 • 2WD • AUTOMATIC
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RENAEANTHONY
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  • 1 POST
Hi,
I have replaced my battery & then the alternator. After the truck is not driven for a few hours the battery goes dead. Any idea as to what the problem could be?

Thanks,
Renae
Dec 4, 2015 at 5:38 PM
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CARADIODOC
  • ✓ASE Certified Mechanic
  • 34,321 POSTS
  • ASE Certified Mechanic
The first step is to verify the new generator is working. You can do that with an inexpensive digital voltmeter. Measure the battery voltage while the engine is running. It should be between 13.75 and 14.75 volts. Let me know what you find.
Dec 4, 2015 at 6:10 PM
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