You have A CLASS A CHARGING SYSTEM so the purpose of the VR is to supply A GROUND FOR THE GENNYS FLD POST either a dead ground for high max charge or a resistive or switched (relay chatter) ground via a field current control relay.
Some Fords used a Class B system where the VR supplied voltage to the Field BUTTTTT you have an A system. The gennys FLD post needs a ground NOT a voltage source on that A system. Likewise a B generator (some Ford products) has an internally grounded Field. Your A type genny has its Fields input connected to the ARM terminal and it terminates out the FLD post where it gets a ground either via a VR or a LHBD light switch.
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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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