Good guess but when a coil overheats to failure I can dump oil out the nose/tower. They dont come back. If you have a very old 5 wire orange box that needed a dual ballast resistor and it got full 12 volts... Any of the early electronic ignition modules had temperature related failures, Ford, Chrysler, you name it. Chrome box for 4 wires and single ballast resistor to protect coil is the way to go.
