Test your voltage at the primary wire running from the switch into the coil. If you've got 12v there AND at the points, you need one of two things, but not both. You can put a ballast resistor inline in the wire, between the switch and the coil, to drop the voltage to 6. The other way to do it is to get a coil for a 12v system that has the resistance built in.
Any good counterman at an autoparts should be able to fix you up with either.
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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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