It is an A type circuit. The wire between the two field windings should be connected, soldered. and insulated from all contact. The end with the connector should be as it was, under the nut, and soldered to the wire it seems to be wrapped around (good connection there). The other connection (far left in the first image) is as it should be, connecting the field winding to the F post on the outside. The field gets electricity from the Nut/stud connection at the brush, sends it through the field windings in series with each other, then out the F terminal where it is sent to the regulator. The regulator, in this type, grounds the field through a set of points that vibrate creating a intermittent path to ground through the regulator frame to the mount to the place it is mounted. The output voltage is thus regulated by chopping the field current into pulses that cause variable field strength (like a slider dimmer switch in the house). Jim
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