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1999 GMC Sierra Battery/Alternator

Tiny
RENAEANTHONY
  • MEMBER
  • 1999 GMC SIERRA
  • 5.3L
  • V8
  • 2WD
  • AUTOMATIC
  • 180,000 MILES
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
Friday, December 4th, 2015 AT 5:38 PM

1 Reply

Tiny
CARADIODOC
  • MECHANIC
  • 33,873 POSTS
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.
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Friday, December 4th, 2015 AT 6:10 PM

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