The wires that go to the heater resistor are actually the ones that are hanging there just to the outside of dash frame. I think that the connector has something to do with the seatbelt buzzer system since the wire colors are the same? Is there another harness that runs to the seats from the passenger side or just on the drivers side? The car is a 73 Challenger BTW but I am not sure what the harness came out of - it came with a rallye gauge setup I bought. Everything else has matched up pretty well so far, but I would really like to put this dang dash in and want to be sure all wiring is accounted for before I do.