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Battery light

Tiny
CAROLYNNEL2
  • MEMBER
  • 2005 CHEVROLET COLORADO
  • 5 CYL
  • 4WD
  • MANUAL
  • 197,000 MILES
I have an issue with the battery light. I replaced the battery and I replaced the alternator twice. Also I changed the main fuse and it's still lit. What else should I check?
Wednesday, January 9th, 2019 AT 3:42 PM

9 Replies

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

You need to check the actual charge rate at the battery with the engine running. it should be 14 to 14.5 volts.

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

I will attach a wiring diagram for you to view as well.

do you have a voltmeter to do some wiring test? the PCM controls turning on and off the alternator system.

Roy
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Wednesday, January 9th, 2019 AT 5:12 PM
Tiny
CAROLYNNEL2
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  • 6 POSTS
I have an issue with the gas tank sending unit because it fluctuates between full and empty. Could that cause my issue too?
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Thursday, January 10th, 2019 AT 8:27 AM
Tiny
ASEMASTER6371
  • MECHANIC
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No, that is a separate issue.

Roy
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Thursday, January 10th, 2019 AT 8:55 AM
Tiny
CAROLYNNEL2
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  • 6 POSTS
Okay.
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Thursday, January 10th, 2019 AT 12:17 PM
Tiny
ASEMASTER6371
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Let me know the results so we can continue.

Roy
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Thursday, January 10th, 2019 AT 12:24 PM
Tiny
CAROLYNNEL2
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  • 6 POSTS
Thank you, I definitely will.
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Thursday, January 10th, 2019 AT 12:38 PM
Tiny
ASEMASTER6371
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You are welcome.

Always glad to help.

Roy
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Thursday, January 10th, 2019 AT 12:40 PM
Tiny
CAROLYNNEL2
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  • 6 POSTS
The alternator was bad I replaced it twice. Third time's a charm thank you so much for your help.
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Friday, January 11th, 2019 AT 2:52 PM
Tiny
ASEMASTER6371
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You're welcome.

Always glad to help.

Roy
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Friday, January 11th, 2019 AT 3:15 PM

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