Petronix testing?

I converted dual point to Pertronix with a single point type distr. I had a few problems starting it, and found that it started & ran good with a newer battery. Electronic Pertronix needs good 12+ volts supply. I tried it w ballast and from 12v side of ballast. Didn't seem to make that much difference, but control unit can burnout faster if ign is hot when engine stopped.