The field is supplied voltage internally in the generator. The F terminal on the gen is grounded externally to make the field have current flow. If the F terminal is grounded with a jumper directly to ground, the gen puts out maximum power. If the Field is connected to a regulator, the field is at first fully grounded through the field contacts inside the VR. As soon as the voltage is high enough to charge the battery correctly, the points begin to vibrate, opening and closing rapidly to control the field current, which controls the output. There are built in resistors which allow the level of current flow to be based on outside temperature, and not go fully to zero output. These resistors are on the bottom of the regulator exposed to external air. A properly designed regulator has no need for a added resistor. Putting one in the connection to the gen F terminal would be reducing the output of the gen, and not good engineering or practice. The light switch will be a light switch from now on. It was used to control the gen output by being full ground output to the light switch body and the electrical box connection to the tractor ground. (when the control knob was in H, D or B positions.) this full ground charged the battery at full gen output when the lights were on, and or when the operator knew the tractor would be started and stopped often requiring more charge. In the L position the operator chooses to charge at a low rate to just maintain the battery while doing day time field work. The L position uses a resistor (on the control switch) to reduce charge rate. A regulator removes this operator responsibility from the playing field. Jim
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