The original unit, the Ignitor, is basically a replacement for points, NOT a high energy ignition. They are NOT recommended by the manufacturer for driving low impedence, high-output coils. They provide a level of spark much like the points they replace, but never "wear", "burn", or need adjusting to keep performance at a peak level.
HOWEVER, if the engine stalls at a point where the module is "triggered" (much like points being closed), the modules are too dumb to shut off, and will sit there and get hotter and hotter (along with the coil), 'til the battery is dead.
Sometimes, when this happens, the $moke gets let out of the module and/or the coil.
Pertronix has come out with the Ignitor II module for POPULAR applications. That unit will drive a HIGH output coil, and is SMART, shutting off coil current when the engine is not running/ turning over. The module controls dwell, based on engine speed.
An advantage EITHER unit has over points is that the Ignitors are less affected by distributor bushing/shaft wear/cam wobble than breaker points.
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