[chevyeater]

Take the panel off, clean the track the best you can. Then grease the track, especially around the slide that moves in the track. Grit and grime causes the window to get in a bind alot of times, which when you press the button it doesnt move and causes your volt gauge to drop. also, check and make sure the wires are plugged into the motor securely. This works wonders on the back window as well.
Good luck. :thumbup