The ballast resistor is toast. They are cheaper than coils, and do go bad. if your coil primary is less than 2 ohms, I would replace it with a 12v no ballast resistor required. However if the one wire alternator went wide open from a regulator issue, the voltage might be 20 plus volts and that was the reason the resistor went incandescent. Battery voltage running should be 14.2 or 14.8 max with a charged battery. A three wire alternator (stock auto wiring) is likely to be the ticket. Bob M wiring diagram in the search for box will find it. Jim
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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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