FWIW, a resistor does not care about polarity. So all that is really needed is the resistor value. Once that is known IF it is not a wire with the built-in resistor that is. Then one can upgrade to a higher wattage resistor to eliminate any future problems. We've done that to our 5.5 Mwatt generators on our governor controls, used for the reason dropping voltage for an actuator.
Although reading the last post I'd go looking for another car if time is not an issue! best regards. Leon H
93 F-150 4X4 110k still strong(them oil changes pay off!)
86 Ninja 1000 60k(sold)
85 300SD 168k
94 C280 58K (what a blast to drive, 100+ easy)