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Battery overcharge

Tiny
THEABOOT
  • MEMBER
  • 2009 CHEVROLET COBALT
  • 2.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
I recently changed my alternator. But the battery light still comes on and off occasionally while driving. I tested the volts at the battery and they range 14 to 19.
Saturday, December 14th, 2019 AT 3:17 PM

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

The range should be from 14 to 14.5. Anything above that is a problem.

https://www.2carpros.com/articles/how-to-check-a-car-alternator

As far as the alternator, did you use a new or used unit?

From the sounds of it, it looks like the PCM may be at fault as that is what controls the charge rate.

Roy
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Saturday, December 14th, 2019 AT 3:59 PM
Tiny
THEABOOT
  • MEMBER
  • 2 POSTS
It is a used alternator but have gone through multiple. From what I was able to gather on the line I figured it might be the PCM. Thank you for your response.
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Saturday, December 14th, 2019 AT 4:37 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would also use a rebuilt unit. Used units may be bad.

You are welcome.

Always glad to help.

Roy
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Saturday, December 14th, 2019 AT 4:42 PM

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