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 - Tractor Profile: Farmall M - by Staff. H so that mountable implements were interchaneable. The Farmall M was most popular with large-acreage row-crop farmers. It was powered by either a high-compression gas engine or a distillate version with lower compression. Options included the Lift-All hydraulic system, a belt pulley, PTO, rubber tires, starter, lights and a swinging drawbar. It could be ordered in the high-crop, wide-front or tricycle configurations. The high-crop version was called a Model MV.
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