The H is positive ground. The small tank originally was for gasoline to start the tractor on and then you switched to the large tank which used kerosene. Most of these tractors had the line from the small tank disconnected years ago and it just burns gasoline from the big tank. If it hasn't been monkeyed with there should be a heat shield over the manifold,a baffle in the exhaust and shutters on the rad. You started on gasoline, switched over to kerosene , closed the shutters until you heat guage was in the "Run"...the heat shield and shutters made the tractor run hotter and thus more efficient with kerosene. My Dad ran an M on kerosene during WW2. He said the tractor set up properly for kerosene would pull like a trooper and seemed to have slightly more power than running on gasoline. You had to know what you were doing when you set up for burning distilates. Those tractors were designed for distilates rather than gasoline.
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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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