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Thread: Harness question

  1. #1
    Join Date
    Jun 2008
    Location
    SE Georgia
    Posts
    417

    Harness question

    I started getting my motor ready to pull today and am wondering how much attention I need to pay to my old harness? I plan on getting someone to remake my old harness from the 5.3 so why do I need to know where the old harness hooks back up?
    Tired ol' 5.7, 5.3 swap in progress
    Handle every stressful situation like a dog.
    If you can't eat it or hump it.
    Piss on it and walk away.

  2. #2
    Join Date
    May 2004
    Posts
    2,120
    You'll still use stuff off of the old harness so you can disconnect it at the C100 firewall connector and where it goes through the firewall under the accumulator. Pull the whole thing out and don't take off anything until you look at the new harness you have built. I kept my old harness and then and wired it into the new harnes soeverything would be plug and play. You'll use the original wiring for the neutral safety switch and a couple of other things like tach, fuel relay, vss, speedometer, etc........


    97 GMC, 2002 LS6.

    1991 GMC Syclone #1428

  3. #3
    Join Date
    Jun 2008
    Location
    SE Georgia
    Posts
    417
    How does that work? I was under the impression that the reworked harness was plug and play. Will I have to cut up the old harness and do some splicing myself?
    Tired ol' 5.7, 5.3 swap in progress
    Handle every stressful situation like a dog.
    If you can't eat it or hump it.
    Piss on it and walk away.

  4. #4
    Join Date
    May 2004
    Posts
    2,120
    Yes, unless you have one or make one completely plug and play.


    97 GMC, 2002 LS6.

    1991 GMC Syclone #1428

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