Electrical Gurus - Power Window and Lock issues

[Greenlee]

I posted this a few days ago, but I think my post was so unclear I may as well start over.

I am finishing up the restoration of my 87’ chevy. I used the wiring harness from an 89’ Suburban for the TBI, computer and just about everything else. Everything has been easy, plug and play, until I got to the windows and locks. Where the door harness split off to go to the rear doors, I just cut it off thinking the front doors are independent from the rear doors. For the driver door, I plugged a driver door harness from a truck into the Suburban harness because the Suburban door harness had a gang of 4 window switches and the truck only has 2 window switches.

My symptoms are as follows:

1) Both windows work from the driver side switch, but the passenger side window goes down when you push the button up and it goes up when you push the button down. The switches are ganged together and it only plugs in one way, so the switch is not upside down. I tried two different switches and they behave the same way. I checked the wires going to the motors and they are plugged in the right way. The passenger side motor was a rebuild I believe, so I guess it’s possible some wire were crossed inside when it was rebuilt???

2) None of the switches work on the passenger side. I have tried two different passenger side window switches and various lock switches. Chances are at least some of my used switches are good.

The mess of wires going to the rear doors has a few that are the same colors. I am beginning to think the wires must return from the rear to the front, and I have cut a link in the chain that operates the switches. I have a wiring diagram, but not sure I’m smart enough to read the darn thing. It looks like a tan wire runs between all the switches and there are two tan wires in the ones that I cut going to the rear.

I am wondering if I need to start over with a wire harness from a 2 door, or if I can piece this one back together? Or maybe I have some other problem? Even if I broke a link between the switches, it doesn’t seem like that would cause the passenger window to operate backwards. Below is a picture of the wiring diagram.

I hope someone smarter than I am about this stuff can help me figure this out! I looked at buying a multimeter at Autozone to see if I can test some wires, but that looks more complicated than the wiring diagram.

Thanks