Location of window relay switch 87 Silverado standard cab

[Davew4884]

Driver side Power Windows switch makes locks work, window switch makes locks work, no passenger window operation from drivers side.
Contrary to what I've read on these posts, my wires to window are Grey and Tan. When I switch plugs with locks that are Blue and Black, lock and window correct themselves but passenger side window will not operate from Driver side. Passenger side window / lock operate fine. I have gone through wires from drivers door through harness to plug in under dash. I want to stick with factory wiring. Just think there is a relay to fault, maybe on fuse block?
FYI, I did find another 87 in salvage yard that I rescued another harness, colors are the same.

 

[dvdswan]

Welcome to the site.

Sounds like some wires are crossed. Windows and locks are 2 complete different circuits. IIRC, there was never a relay in the C/K power window circuit which is why the move slow.

Wiring diagram for you year can be found here... https://www.gmsquarebody.com/threads/1973-1991-wiring-manuals.14498/

 

[gmbellew]

check for mouse damage to the harness under the dash....