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Old 10-28-2012, 12:43 AM
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Typically, if a coil has a ballast resistor it will need a ballast resistor no matter what type of ignition is used, points or electronic. The TFI coil shouldn't need a resistor though. Sounds like you either have something wired wrong or just a bad ignition module (Duraspark box). The TFI coil will work with the standard Duraspark box. A lot of people use the GM HEI ignition module with the Duraspark distributor. Search Google for "Duraspark with GM HEI module" and you'll come up with several sites. The GM module is just higher quality than the aftermarket Duraspark boxes. Ford quit making them long ago!
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