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Anybody know what this resistor does or what its for?? its location is at the moment is flopping around the NSF inner wing just by the battery.

 

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I think it's the Dim Dip resistor for the head light.
It means that you can't accidental have the engine running with the side lights on as that resistor will send some power to the dip filaments to light them up - approx half brightness.

It's also what has to be disabled if you upgrade your wiring loom with relays to drive the head light bulbs.T:
 
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