Tell me about your ballast resistor failure.

I don’t ever remember any other ballast resistor other than the common dual ballast resistor back in the day. The half ohm was points and the 1.2 was electronic. The ignition systems were designed as “systems”, so changing parts can be problematic. What is really important is the current through the coil rather than the voltage applied. However, the current is hard to measure without more sophisticated equipment, so everyone usually talks about voltage.

If you see a damaged part, that is usually a good place to start troubleshooting. I don’t know how many times I have come up with a complicated theory for a failure, only to find a blown fuse later….