MSD Pro Billet ignition- are these unusually "voltage sensitive?" Got stranded, looking for ideas

A ballast resistor is bypassed during cranking so and then current flows through it in the run position. Not sure with the MSD if it is part of the circuit but when it is, the car will crank and fire. As soon as you let off the starter and the ignition switch goes to run position, if it is an open ballast resistor, the car will quit instantly. Does not sound like a ballast if it ran for 30 seconds.