Sounds like a broken wire, probably where it runs through from the door to
the body ... common problem since in this location wires are repeatedly
flexed each time the door is opened / closed. I'd meter each wire from the
motor/connector in the door to a chassis ground to determine which is
broken, then confirm it by doing the same from behind the kick panel to
ground. If that's it, splice in a new wire, using a multiple stranded wire
(to help survive all this flexing).
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