wiring harness

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    Getting 12v at duramax fuse block, but 3v on Avalanche body.

    Well, title says it all pretty much. I'm still trying to figure out my 2012 Avalanche/duramax swap. Finally got everything sorted out wired up, and even put power to it. This was last Friday, and it was great, lights on the dash came on, all the interior lights, and everything seemed to be...
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    Transmission problems -- P0722

    2015 duramax 2500HD high country. Code p0722 output sensor we replaced sensor and truck isn’t shifting out of first. And Speedo wasn’t working. Got speedo working but no shifting out of first No broken wires to tcm getting 9 volts at sensor and 9 volts at tcm. Cannot find any wiring schematics...
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    Right rear lights situation Help Please

    Hi, I have a 2008 GMC Sierra 2500 HD 4x4 Duramax and my brake light, blinker and running light on the rear passenger side is not working. The back up lights work. I have checked all fuses, replaced all the bulbs, replaced the rear wiring module and the harness from the module to the right tail...
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    Question: Anybody have a crank sensor plug on an old wire harness?

    HELP!!! I have damaged the plug that goes on the crank sensor (don't ask how, definitely a bad moment) and would like to splice on a new one. Looking for someone that has salvaged out a wiring harness. I have an '03 2500 HD.
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