Switch is shorting by the sound of it, take the door trim off again and get 2 wires from a 12v battery and put one each in the green plug after you un-couple it on the motor side of the wiring and see if it moves freely up and down, reverse the wires in the plug to get it to go the other way.

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Beaten up old 98 Gen 2 Liberty, 13.0, stock V3 STI running gear.
07 Transit motor home
69 VF & 70 VG Valiants needing full restoration
Yamaha Zooma 50cc rocket hopefully going with the Transit.