I have a commander 302 but it might as well be a Mercruiser most of the parts on it are identical to a Mercruiser. I'm having an issue with my ignition systems it's an old points ignition and for some reason a brand new ballast resistor over heated and split right in two, what would cause this issue? Faulty wiring or just a defective resistor? There is a new ignition coil a new solenoid. Any help would be greatly appreciated.