[Excaliber]

Uh oh, it just dawned on me that many of todays modern coils work fine with a module but will BURN UP if you use 12 volts direct to the primary circuit. Many of them REQUIRE a ballast resistor that drops the 12 volts to about 6 (7 or 8 maybe).

It's possible the coils that have been tested with the above wiring schematic are now toast.