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Final Wiring Harness Inspection and Research

19:05
26:49
47.5K views

At 19:05 in

GMT400 Suburban Frame Off Build: Body Removal & Getting Ready for Frame Paint! (What To Remove)

What happens here

After removing the engine, the creator notices that the main wiring harness (the engine side) is still partially connected to the body. He realizes that the plugs for the factory PCM (Powertrain Control Module) and TBI (Throttle Body Injection) computer run through this harness, which is integrated with several other systems inside the vehicle. He learns that to fully detach it, he would need to go inside the vehicle, dismantle the glove box, unplug the harness from the computer, and then pass it through the firewall. He decides to leave it dangling with the body for now, as it's not connected to the frame anymore, to research the best approach for the new engine management system later.

Goal: Confirm all wiring harnesses are disconnected from the frame and plan for future wiring needs

Tools and materials

  • Factory PCM — Powertrain Control Module
  • Glove Box — Interior compartment that may need to be removed to access wiring
  • Main Wiring Harness — Electrical harness connecting various vehicle systems
  • TBI Computer — Throttle Body Injection computer

What they say

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to disconnect up here well apparently this uh plug here doesn't actually unplug you have to go inside take the glove box apart unplug it from the computer inside there and then pass it through the firewall and I only know this because we just looked it up we want the factory functions to work from inside like the AC HVAC that stuff but we have a whole gauge cluster that's new from New Vintage USA so we don't know how their sending units work if they're independent or what got to do research on that so we can get to figuring this out well after some messing around I found out that the two plugs for the factory PCM in there like the TBI computer are run through this harness with a bunch of other stuff like things that control the heater control and the starter and things like that things we need so we can't just cut that and I remembered that this main plug here that I was fussing with earlier came apart so I thought maybe it could just separate the engine side from the rest of it which the engine would be the top so took that apart unplugged a couple things from in here and now this whole harness the engine side is completely tied to the body has nothing left to connect to the frame so when we lift the body that Medusa will just dangle there and then I can do more research and figure out how to clean that up or whatever place it I I don't know I don't know what's out there I

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