How can I remedy my faulty front psgr. elect. window on my 1996 Mercury Mystique LS?

I have replaced the switch, the window channel and the window motor, but the window still will not open. I noticed that when I removed the main switch from the drivers side door, pull on the switch and press the switch to open the psgr side, the windows open. Is this a problem with my wiring sys or the main switch? I appreciate any help you can provide. Thanks!