Yes, for sure don't fault the seller until you try post #2.
You need a schematic and multimeter.
Do you measure voltage across the connector pins when you actuate the switch?
Do you measure continuity in the wires from switch to door?
The wiring goes thru a region that bends to get to the door and can thus break, though usually see that in driver's side door, unless you get more dates than most of us losers who mostly drive alone.

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