I need to run my power window down on a '90 Carat so I can remove the window
and components from the door.

Stared at the drawing til I'm cross eyed, but am no good at electrical
drawings.

Does the power window motor use the housing as a ground and the power switch
wires to go up or down?

Or does it just reverse the positive and negative to go up/down?

Thanks,

GregM