I would guess it’s going to the Starter solenoid to power that up. There isn’t enough info on that diagram to see where the wire comes from at the other side of the switch.
It looks as if the top part of the switch is the lights, the next part is the engine kill, and the bottom part a feed from the ignition, through the switch to the starter solenoid. But that’s all just a guess without the rest of the diagram.
I’m looking to see what I can find but my own manual doesn’t cover the later models.
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