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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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