Tell me about your ballast resistor failure.

Bewy said
That is why the fully enclosed/sealed BRs are better. A good thump or bump can break the brittle former the wire is wound on. The Nichrome wire also becomes brittle over time from so many heating/cooling cycles.

So why did Ma Mopar keep the .5 OHM Coil side of the dual ballast resistor open when they first developed the electronic ignition

Then at some point in the mid 70s switched the Coil side of the dual ballast resistor to 1.2 OHM and sealed it

Same Mopar Part # Dual Ballast Resistor
First is .5 OHM Coil Side Open

Second is 1.2 OHM Coil Side Sealed

No Jobber or Aftermarket sells a Dual Ballast Resistor with an .5 OHM Coil Side Resistor