Hot ballast resistor & ICM

I'm pretty sure any ICM you buy today will require only 4 pins. Early on the electronics wouldn't run on 12 volts so 1 part of a dual ballast resistor protected the electronics via that 5th pin. Modern electronics changed things. Some aftermarket modules did show the 5th pin ( prevented end user confusion ) even though that pin wasn't connected to anything inside.
Repeated melting ICM gel coat, overheating resistors, I suspect the coil.