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Its probably just to make the connection from the AC neutral to ground to test for reverse polarity. To actually reverse the black and white wires on your boat would cause much excitement and would be potentialy very dangerous. Dave
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.