The OEM switch is more or less square and the terminal screws go straight into the rear of the body. And the coil on your switch is the dimmer resistor for the front lights. (Note a generator field resistor has more turns of fine wire wound onto a flat piece of mica)
Looking at your 2nd photo, it looks like the hot (supply) is the terminal at the top of the switch. The terminal at 9 o'clock would be for the front lights. And one of the two lower terminals is for the rear light.
Correctly wired all lights will be off with the knob turned left. In the center position the fronts will burn dim; the rear bright. And the right position has all lights will burning bright.
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Tip: The resistor coils gets HOT when the lights are burning dim! Be sure no wiring touches the coil with the cover installed. Otherwise heat may burn thru the insulation and cause unpredictable results(!)
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