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I have had my 2004 6.0 X for a year now. The rear passenger window has never worked for me. I finally had time to try to find out what's going on and I think I have a bad wire.
closest I've come to it working is I got the light on the rear passenger switch to come on at the RP door, and got the motor to go up... Only up. No idea how I got that to happen, and it stopped soon after. no amount of wire jiggling has brought it back. I started looking at the wires in the driver door jam and i have no idea what goes to what. Does anyone have a color key that says what wire goes to what?
For a quick testing method, you can do this with the key off, grab a 9 volt battery and you can jumper right to the pins to check motor/switch issues. The 9 volt battery is strong enough to run the window motor.