Thread: 12V electric power failure

The 2001 GTP wouldn't start. The electrical system appears to be completely dead, but the battery is at 12.6V. When I probed the large positive wire on top of the fuse box behind the battery it reads 5V, but the reading is unstable. I haven't been able to find the schematic in the manual yet, but I'm guessing something between the battery cable and the fuse box has failed.

Check your grounds while your at it.. easy one under the battery.

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update: looks like the smaller black cable from the battery to the underhood fuse box is rotted and intermittent. Can I buy a new cable assembly anywhere?

Nailed it lol.. I get that stuff from the junk yard lol..

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Update again (you can't edit posts?): $83 from GMPartsDirect 12157012 Positive Cable

Sounds steep to me. 5 bucks at the u pull it yard

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I thought you said black cable? That's a positive harness you linked.

Napa used to sell battery cables that are pre made in various length for both positive and negative, perhaps they still do.

I'd check there or at another parts store before buying a new cable from GM, if that is still an option. Even it I couldn't do that I would just make my own cable for like $20. Bulk wire from napa and new cable terminal ends are cheap.

Originally Posted by Lifespeed

LOL, buying another rotted cable and spending an hour or two to install isn't the way I do car repairs. Even an old GTP.

Your in California I'm in Oregon cars here arnt all rotted out.. beat to crap yes but not rotted. Same where you live wires are typically in good condition since W-body's fill the yard.

No figuring required just go find a good one and take it home.

Or order it online wait for it to come. Or go by the parts and remake them to length.

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