What Larry W says is accurate. You can overheat the coil and resistance wire as a result IF you leave the ignition on and the car not running.
Those visionary folks at P-E anticipated this and once you put in their Ignition Switch Controller you can no longer do that.
I have to admit I killed a few coils in my time as a result of working on the car with the switch in the run position.
The ignition switch controller protects me from myself as much as anything else. I swear at times you can see me giving off sparks in the dark. Electric personality. That's me, or is that electriphiling personality? Maybe self-electrifying? Careful...don't touch that red wire over there ok?
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