If the light switch has 4 positions L-H-D-B it was equipped with a cutout relay OEM. The cutout looks very much like a regulator, and even has a F terminal on it. (usually not hooked up to anything if the tractor was equipped with lights OEM. The true regulator if equipped will have two internal relay looking things inside it. A cutout will have only one. If the light switch is, as above, with 4 positions the first position Counter clockwise is low charge. All other positions are full charge rate. The light switch is completely separated from the charge control inside the switch, and sends electricity to the lights in D and H positions. The L and H positions provide a ground for the F terminal on the Gen. The L position grounds through a resistor, lowering the charge to about 4 amps at maybe 6.8 volts (at 3/4 throttle). the H position and D-B positions just plain ground the field, allowing it to charge as much as it can, probably should be about 7 to 7.1 volts at high engine speeds. The field windings get electricity from the commutator 3rd brush and are grounded to complete the circuit. Jim
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