The light switch must be grounded through the body of the switch. A 2 ohm resistor of 80 watts dissapation can be used in place of either the field resistor, or the light resistor. The only thing common to those switches is the shaft that turns them. They are separate internally. The light switch has (basically) two OFF positions. They are L and H. In those positions the field is grounded through the resistor in L, and direct to ground in H. When the lights are on D the Headlight juice runs through the resistor for lights (top), the Rear light is full on, and the field is still on full ground. When the switch is on the B position, The lights are getting juice directly from full volts, no resistor. The rear light is still full volts, and the Field is full ground. Jim
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