Dad's M is similar. It'll crank like nobody's business, but won't fire until you release the starter button. It's a 12V conversion.
My theory is that the starter is pulling the battery down so far that the coil isn't getting any/enough juice to fire properly.
As I understand it, the early 12V Farmalls had a bypass that put a full 12V to the ignition coil while the starter is cranking, bypassing the resistor that normally reduces the voltage down to 6V for normal running.
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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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