Voltage at Taillights 66 Dart?

67Dart273 said
Has the vehicle see a lot of moisture/ condensation or "leak" up in there around the switch? Of course switches do fail..............

I checked the continuity from L1 to L6 pulling the switch in and out, nothing to headlights. I am thinking of opening up the harness to check the welded splices for the low voltage, what do you think? Thanks