I recently picked up a set of EX doors to swap out the internals into my manual doors. Drivers side was perfect, no problems... passenger side only goes down though... When I put a wire tester into the "up" wire between the switch and motor, it shows a signal when I hit up on the switch, but I get nothing from the motor. Does that mean switch is bad, motor is bad, or wiring from switch to motor is still bad? Down works perfect.

 

maybe you forgot to compress the spring assist on the passenger side ... motor by itself it to weak to up-it

my 0.02