Today was a long day, but very productive. I probably could have gotten all of the wiring done today if I wasn't so picky about the way I do things. Since this is my car and I plan to keep it for quite a while I not only want it to be right but I want to be able to work on it later on.
First step was to pull the Lexus ECU and harness to strip some wires.
Here is the engine harness out of the car "pre-diet".
All this crap (and more later) came out of that harness.
This is all of the 2JZ motor harness that went back in, it has connectors for MAF, A/C, Ambient air temp, starter, and some trans stuff I need to sort out for back up lights.
Re-installed with the thinner harness, and done with this portion.
When we moved over to the GM side of things the intake came back off to get to the loom on the back of the motor.
I didn't get any pictures of the LS1 harness but it was a giant mess of wires that got thinned out similar to the 2JZ.
This is what took so much longer but makes the swap serviceable. Any place where the two harnesses were soldered together and or loomed together I added connectors to be able to pull the motor with less hassle should I ever need to.
Here is where the Lexus MAF meets the GM loom to run over to the passenger side.
This is right below that connecting the Lexus ECU (piggyback) to the GM temp sensor. Since they use the same voltage range I am using one to run both for the LS ECU and IS gauge.
This one isn't quite finished up yet but ties the MIL, Tach, Fuel Pump, Brake Switch, OBDII, Switched Ignition, and maybe back-up lights. The connector is on the firewall just over the passenger side header.
To keep the factory look (and save me from having to but some) I cut connectors out of the Trans Am body harness to splice all the harnesses together.