On my 1974, Delta 88 the passenger side, power window will roll up or down with the master switch on the driver‘s door, but will not roll up or down with the passenger side switch. I have checked the switch and even swapped it with a switch. I know that works from the backseat and I still can’t get it to operate. I tried to jump the wires in the three pin terminal and still nothing. I was curious if there was a relay somewhere that I can’t find that may be bad. I also checked the wiring between the switch and the body wiring harness thinking. Maybe there was a broken wire, but everything checked out good. Any help would be much appreciated.

 

There is only one isolation relay that operates all the windows. If anything works, the relay is fine. If the switch is good but the controls still don't work from one door, it's kind of obvious that the wiring to that door is suspect. Most likely is a break where the wires flex going into the door shell. Also carefully inspect the contacts inside the switch connector for corroded, burned, or damaged terminals.