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5.3L Chevy Motor Swap – Wiring Harness

This is the most confusing part of this project… there are SO many wires in the stock motor wiring harness that came with the motor/transmission setup… it’s CRAZY!  First things first… if you’re doing this project, do yourself a favor and at least checkout one of the guys who has done more work on documenting this stuff that pretty much anyone, at least from what I’ve found… his Name is Brendan Patten and he has a website at  .   Be sure to check it out. I couldn’t do this part of the project without his help.  As a matter of fact, I actually sent him my PCM and had him re-flash it for me for all of the specs I have for my Jeep and with all of that, he only charged like $75 which included shipping it back to me.  Sweet!

So, instead of trying to figure out the wires in the garage, I took the whole harness down to the office so I could

work on the floor with it and take my time, and have good light, and plenty of reference computers nearby for looking up the information on Brendans site.  Here’s what I’m working with… and the way it looked on my floor on 8-10-11.

All I know is, this project would be a LOT more difficult if I didn’t have something to go from, and Brendan has done an amazing job with documenting all of the stuff on these motors, I can’t tip my hat to him enough!

A list of items to get for this part of the project was graciously provided by Brendan.  Here is what he suggests:

Here I will outline building your own fuse block and attach relay sockets.  This is a general guide that will work for most any wiring harness.  I use this same basic setup for LT1, LS1, Vortec Trucks etc.First off, the parts you will need to build the fuse block and OBD2 Diagnostic Port.

Category: Forex

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