Join Date: Mar 2010
Location: Far northern Chicago suburbs
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Ballast resistors were used to drop voltage to the coil during normal run conditions. Normal system voltage was not needed and caused rapid wearing of the ignition points. GM used a resistance wire to the + side of the coil to drop the voltage down. Some years had a second wire to the coils + side, this wire lead to the starter solenoid and was a bypass to allow full voltage to the coil during engine start. The theory being that when the starter was engaged the voltage would already be low and the ignition system needed all the power available. The original 67 wiring should have had two wires, according to the books I have. A black and a white braided, the latter the resistance wire. I'm not sure what the requirements are for the point elimination kits, my guess is that they use full power, and if so would require running a new wire from a switched ignition on source as well as from a source during engine start which should be the exsisting black wire. Check the "point kit" for wiring details. Have a volt meter ready and double check for power, in both positions, start and run.