Remove door panel and measure voltage drop between the 2 wires that go to the motor at the screw terminal inside the door. If you push switch and no 12 VDC there, go upstream and test right at the switch. One wire that feeds thru the rubber bellows where the door pivots had broken in my 1985.

Otherwise, the normal issues: "corroded fuse tips" (both LF & RR windows don't work) and "spilled drink on console switch" (open up switch and clean).

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans