Simple transformers (like an ignition coil) would have 4 leads (at least internally) ; 2 for the primary, 2 for the secondary. In a lot of transformers 1 lead of the primary is "common" with 1 lead on the secondary, which are both typically connected to ground, hence the modern 3 terminal coil. So, my current coil has 4 leads, a sparkplug type wire and a screw terminal going to the distributor, and a + and - on the primary side (screw terminal) which go to ground and the start switch, respectively.
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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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