JMOR, There are no markings on the VR. The wire size going to the fields and armature are both the same size, about 10 or 12 gauge. There is only an F and A stamped on the genny.
So, if I got this right, the field windings are powered up inside the genny from the + armature side which is connected to the armature brush and the VR simply supplies a ground path for the fields. The other brush going to the communtator is already connected to ground.
By connecting the Armature to the +12v, current will flow throught the field windings, creating a little residual magnetism in the fields to get the genny excited.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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