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I have 3 different color wires in my factory harness and I also do not have a fuse there.

White wire = Stern Light side of switch (+)
Green wire = Bow Light side of switch (+)
Black wire = common ground for both

Wires colors may vary through the years and for different boats.
Here is how to wire the switch.
http://www.whalercentral.com/articles...icle_id=51