The switch is attached (internally) to the same mechanism that operates the butterflies in the manifold. It purpose was to ground the magneto when the tractor was running on diesel. Presumably to cut down on point erosion? I imagine it was cut either after it broke or when someone who didn't know what they were doing couldn't get it started and began clutching at straws. Sam
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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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