My truck is a 97. The driver window will go up but not go down. Passenger works fine. The actuator is fine. It will go down if I reverse polarity. Also the switch is fine. Tested current with a 12v probe. The bulb lit when the window should go down. Here is the weird part. Relay #4 under the dash...if I force the relay, the window goes down. The only thing I can think of is possible bad GEM module, as it controls the windows I've heard? Otherwise, everything seems to be working that should be, it's just the power is never sent to the window (or sent to switch the relay). Any ideas where I could check on where the signal is dying?