Check power at the window
Have you checked for voltage at the window plug itself? If you have power there, I'd suspect a break in the window wiring.
"Tell me and I will listen, Teach me and I will learn, Show me and I will accomplish, Involve me and I will succeed."
'84 300SD 256,000 Gold on Brown (Mileage Award)
'86 300E 246,000 Blue on Tan