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Battery not charging, need instructions on how to test wires from alternator to PCM with a multimeter

Tiny
JESSICA DUBOSE
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • 30,000 MILES
I have replaced alternator battery and a few fuses. When I jump start it will start; remove cables, shuts off. If battery has a charge it will run until battery drains. Fusible link seems fine, and I don't know what would make it not run the dang truck. I have run every wire I could find to look for damage. If you could shoot me some detailed instructions on how to test wires from alternator to PCM with a multimeter that would be great.
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Wednesday, June 23rd, 2021 AT 10:33 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
No problem. here is a guide and the alternator wiring diagrams so you can see how the system works:

https://www.2carpros.com/articles/how-to-check-wiring

Make sure the fuses are good. Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.
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Thursday, June 24th, 2021 AT 3:01 PM

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