Thread: 12V electric power failure

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  1. #1 12V electric power failure 
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    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.
    Lifespeed
    2001 GTP
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  2. #2 Re: 12V electric power failure 
    GTP Level Member wowitsfast's Avatar
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    Check your grounds while your at it.. easy one under the battery.

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  3. #3 Re: 12V electric power failure 
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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?
    Lifespeed
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  4. #4 Re: 12V electric power failure 
    GTP Level Member wowitsfast's Avatar
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    Nailed it lol.. I get that stuff from the junk yard lol..

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  5. #5 Re: 12V electric power failure 
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    Update again (you can't edit posts?): $83 from GMPartsDirect 12157012 Positive Cable
    Lifespeed
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  6. #6 Re: 12V electric power failure 
    GTP Level Member wowitsfast's Avatar
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    Sounds steep to me. 5 bucks at the u pull it yard

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  8. #7 Re: 12V electric power failure 
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    I thought you said black cable? That's a positive harness you linked.
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  9. #8 Re: 12V electric power failure 
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    Quote Originally Posted by wowitsfast View Post
    Sounds steep to me. 5 bucks at the u pull it yard
    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.
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  10. #9 Re: 12V electric power failure 
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    Quote Originally Posted by bandook View Post
    I thought you said black cable? That's a positive harness you linked.
    Yes and yes.
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  11. #10 Re: 12V electric power failure 
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    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.

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  12. #11 Re: 12V electric power failure 
    GTP Level Member wowitsfast's Avatar
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    Quote Originally Posted by Lifespeed View Post
    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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  13. #12 Re: 12V electric power failure 
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    Thanks guys, I appreciate the money saving tips and I know these cars aren't worth a lot anymore. My son has been driving the car for a year, it will be 5 more years before he finishes college and can buy himself a better car. This GTP needs to last a while longer.

    It doesn't burn oil, runs strong and has had regular transmission fluid changes it's whole life. We already rebuilt and FE5'd the suspension, fixed the supercharger drive, belts, water pump, radiator, MAF, brakes and a few other things. I'm OK with paying more for an OEM cable if it fits correctly and stays reliable while he's on his own focusing on school.
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