I have a 97' F250 super cab 4x4 7.3 turbo diesel. The passenger side power window will not go down. I have reversed the wires to the motor and I can manually run the window up and down. I thought it would be the switch so I swapped it out for the driver side window that operates ok and it still does the same thing. I have 12 v on both wires to the motor to ground individually. Any one have any ideas