Hot Ballast Resistor

The ballast resistor will get hot, it is a resistor and that is why it is made out of ceramic and not plastic.

You can use the old style single field alternators but you are supposed to use the constant voltage regulators when converting to Mopar electronic ignition. I am using the old style alt with the constant voltage reg and Mopar electronic ignition and everything works fine. I would bet that you need to change your box it is most likely your problem. Since the resistor is getting hot it is resisting. If it was cold then it would mean no voltage was going thru.

Chuck