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 - Gatherin of the Orange - by Rick Nikolich. In July of 1998 I was talking to fellow Allis Chalmers collector Mike Schilling about the annual "Gathering of The Orange" AC show coming up in August of 1999. He got this wild idea that we should get a convoy of AC tractors and drive them from Charlotte, Michigan 105 miles to LaGrange, Indiana.
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