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 - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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