Originally Posted by w261w261
I assume that both passenger and driver's windows do not work when this happens. Everything else works ok, though? So it isn't the ground connector screw, because other stuff goes there. The first connector upstream from the ground screw is a 14 pin orange one on the dash fuse box (I have an '89, so your specs may be different). You might try unplugging it and cleaning. The ground wire coming from the windows is black, btw.
Moving back to the driver's door, the ground wire is spliced together with other grounds. The next connectors are separate for the driver's and pass windows, so if both windows don't work, I don't think the problem is there. The ground wires are all black it seems. I guess you could have an intermittent break in the harness as it goes through the flexing of the door on the way to the dash (i hope not, I had a break in a harness like that on a '67 Lincoln convert and it took me all day to track it down).
On the supply side, it looks like connector C317 (white, 10 pin) inside the drivers door up and a little back from the speaker routes power to both drivers and pass windows. Maybe it's dirty. Again, if both windows (you have a 2 door, right?) don't work, there's only a few common connectors upstream.