There are two switches connected to the same shaft on a 4 position SW. They are not connected electrically at all. the light sw component is just that sending voltage to the lights either through a wire wound resistor: Dim lights (D). Or directly to the lights : Bright lights(B). The Generator charge component is a ground for the field. The field wire is connected to ground through a different wire wound resistor for (L) Low charge, Or directly to ground High Charge (H). THE charge level stays on high charge in H,D,and B positions, so that the battery stays charged with the lights on. the L position is for day time running after about a half hour of High charge. If the operator remembered to switch the rate!!! The generator field circuit is grounded through the case of the switch, and the metal of the electrical box/and steering post. So that extra switch is pretty much useless unles you figure out a use for a ground with a resistor in one position, and full ground in all others. JimN
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