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I'm close to getting my 5.3 and T56 in my '92 but I still can't seem to get my hands around exactly what I need to retain from my original harness that came in the truck. The original set up was a 4.3 with a 5 speed manual.
I have a harness for the 5.3 that Allen reworked for the swap.
It seems like I can get rid of the original pcm, but I am not sure how much other wiring I can get rid of. Some of what goes to the pcm also goes across the firewall and back inside behind the drivers side. Do I have to cut anything or will everything unplug?
Also do I have to retain the fusible links that are under the cover on the firewall on the passenger side alongside the fuel pump relay?
I am planning on retaining the factory gauges. FWIW.
Hope this makes sense.
I just want the engine as neat as possible and would like to get rid of as much wiring as possible, cause I obviously adding a bunch with the new 5.3
Thanks in advance
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How you integrate your harness into the 92 harness is really up to you. Personally, I would remove the stock PCM and all wires that run back to the original engine. The original harness has power leads for the PCM, injectors and many other items that come directly from the fuse block in the truck. Be sure you mark each and every wire before removing it so that if you have to come back to something you'll know what it was and where you removed it. Do not remove the speedometer calibration box that is under the glove box, you'll need it later for the ABS to work properly.
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Thanks that will help get me started.
