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1997 Chevy Suburban Battery voltage drops

Tiny
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  • MEMBER
  • 1997 CHEVROLET SUBURBAN
  • V8
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
When I have both the front and rear ac on at full blast and the truck is not moving but in gear, the battery voltage begins to drop. I have already replaced the alternator and it didn't help. Any ideas?
Tuesday, May 18th, 2010 AT 4:47 PM

3 Replies

Tiny
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  • 31,938 POSTS
Hi there,

What is the alternator out put readings when you do this? And is the idle a bit low and the alternator has not kicked in?

Mark (mhpautos)
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Tuesday, May 18th, 2010 AT 5:18 PM
Tiny
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Thanks for your response, I don't know how to check the output reading for the alternator and what would you consider too low for idling, thanks for your help
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Tuesday, May 18th, 2010 AT 5:43 PM
Tiny
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Place a volt mete r(+) on the alternator output terminal(large terminal) and neg (-) on to battery earth, idle the engine and take a reading you will want about 13.5 V there abouts, what do you have.

Mark
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Tuesday, May 18th, 2010 AT 6:04 PM

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