A true 12V coil will have a 3 ohm primary winding. a 12V with external resistor coil will Have a 1.5 ohm primary winding hooked in series with a 1.5 ohm external resistor to end up with the same 3 ohms total resistance. The advantage of the coil that uses an external resistor, is that you can wire it to bypass the external resistor to make extra hot spark for starting, then having the resistor back in line for running to give long point life. This was pretty much standard equipment on all automotive 12V point type ignition systems.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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