[Oldsguy]

Usually the two wires are actually just one-in-the same of a series circuit. At least that is what I have experienced. So the positive terminal is for the +12 volts (resistance wire and perhaps a terminal block attachment), the negative wires go to the points and then the other one MIGHT be to the tachometer if the car has one. To answer you last question, I would leave those wires and hook up your resistance wire and you should be good to go. The only way to be sure would be to trace those wires to their destination, and that might be difficult.