Ballast resistor Q's
... just upgraded to an electronic dizzy ...
I think the confusion is that we don't know what dizzy you have. If the 1975 car in your sig, then it already had electronic dizzy, so what is this "upgrade"?
I too suspect your problem will return. Since it sometimes worked before, your ballast probably wasn't broken (normal problem for "dies when I move from crank to run"). Putting in the replacement surely wiggled some wires. I would suspect the feed-thru terminals in the bulkhead connector (any melted plastic?), the ignition switch, or seat-belt interlock (your year?).
Bad Sport, I agree with your statement. The ballasts also protected the coil and ECU in the early Mopar electronic ignition. As Kit said, HEI controllers have smart electronics to control the coil current and thus don't need a ballast. Mopar did that too, but buried in their "spark computer", so hard to leverage for a retrofit (plus those were temperamental), and now inside the engine controller (PCM).
