Did you read the directions included? When using the supercoil with stock Chrysler or Ford Duraspark systems, use the ballast specified by the manufacturer.

There is a reason to use the ballast and it's not to save the coil.

Straight from the FSM, again

"The compensating resistance serves the same purpose as in the contact ignition system, that is to maintain constant primary current with variation in engine speed."


The compensating resistance is the ballast resistor.


They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.