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Electrical battery gauge on dash continues to drop between 9-14

Tiny
JAMES CARTER2
  • MEMBER
  • 2009 CHEVROLET AVALANCHE
  • 5.3L
  • V8
  • 4WD
  • 145,000 MILES
I have a new battery, new alternator, both have been checked and working properly. My battery gauge on dash continues to drop between 9-14. I've owned it for 3 years and has never done this before. Is there a fix for this? I also changed the 175 amp fuse that's between them. Continues to do it.
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Monday, July 20th, 2020 AT 11:41 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,244 POSTS
Hi,

The 14 is normal when running. The 9 indicates there is no charge from the alternator. Is there anything you can do to cause the gauge to drop like that? For example, a heavy electrical load on the system? Are you certain the alternator belt is tight and in good condition?

I want you to try a test. I need you to confirm that the voltage is dropping at the battery as well as on the gauge. Here is a link that explains how to check:

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

Let me know if you get the same readings at the battery as you do at the gauge. You will need a helper to do this.

Take care,
Joe
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Monday, July 20th, 2020 AT 2:04 PM

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