A ground post is more than likely a connection to the bonding system from the tray and case to your through hulls and tanks if the tanks are metal. I suggest hiring a marine electrician if he does nothing more than instruct you on the wiring. A generator on a boat is considered a source however once the source is changed your white or neutral again assuming this is a single phase 110VAC 60Hz generator should never backfeed effectively bypassing the one point the they need to be electrically connected at the dock pedestal.
Bill
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