Possible electrical short

1995 CHEVROLET 2500
200,000 MILES
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MHARTSE
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  • 1 POST
My test light is very dim, when testing the fuse box AC spot, when the fuse is out. I do have the truck running and AC going full blast.
Jul 13, 2018 at 7:13 AM
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STRAILER
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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This sounds like it can be one of two things, first I would check the alternator output.

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

If it checks out I would wiggle the positive battery cable (truck running) to see if the voltage comes back if so the positive battery cable needs to be replaced.

Please let us know what you find.

Cheers, Ken
Jul 14, 2018 at 6:02 PM
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