My 340 in my 66 developed issues :-(

65 Mopar said
Without the ballast your saying..? Then I'd get the consistent 12v - what I was reading in the article the ballast only gives 12v at startup then it drops the voltage to 9v...

With the ballast to provide a buffer of current for the canister coil. See: what is the purpose of a ballast resistor? | Moparts Question and Answer | Moparts Forums

-Kurt