Here Goes: There are two resistors on a 4 position switch and one fuse. one of the resistors is used to reduce charging (field control) and it is not used at all, the terminas is not used either. The terminal (formerly connected to the Field terminal of the gen) will show ground to light switch body when on H D or B. it will show a resistance of between 2 and 4 ohms (if it is good) when in the L position Full CCW. If this terminal is connected to anything with volts, it will spark After assuring it is not connected, the remaining terminals (three) should be the input to the fuse, the rear light supply, and the headlight supply. If the switch was completely disconnected from the wires, these terminals should show no connection to the switch body in any position. If they do the switch is bad. When connecting the wires connect the supply wire first. It should test voltage with the battery connected. With the switch turned to either L or H, there should be no voltage at either the rear light terminal or the Headlight terminal. On D (third click CW)the rear light terminal should show full volts, the headlight should show reduced voltage, but not much). On B the voltage should be full volts on both Rear and Headlight terminals. If this checks, and your test light confirms the fact, test the wires going to each light at the light. if no voltage when on D or B , the wire is bad. if voltage but no light the bulb bulb ground, or fixture groung is bad. Best of luck, Jim
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