May seem a silly question, but have you tested the headlight bulb to be sure it's working? If that checks out okay, test the wires from the headlight back to each join/ connection, working back through the high/low beam switch (I'm assuming you are aware that the ign switch controls the lights on/off on some Ss50 models) then trace back to ign switch, paying special attention to all bullet connectors for cleanliness and tightness. Let us knowvhow those checks go.
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