FUSE.
very common.
pull your fuse panel, and look at the sheet, it will tell you which fuses.
also, the fuses get stressed, because the window tracks get old and sticky.
pull the panel and clean and realign the rails and regulators and then regrease them. amazing how much faster the windows are when properly maintained.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!