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Old 05-27-2013
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Two separate problems

You have two separate problems, and maybe a common fault. Input power GFCI outlet tripping offline is caused by different current on the hot and neutral wires going to the boat. To rule out a problem with the outlet plug in a regular household 3 prong tool instead of your boat and see if it works.
Since your boat main circuit breaker sometimes trips that indicates an overcurrent condition somewhere in your boat. There may be a short somewhere between hot and ground and neutral that causes the boat breaker and gfci to trip.
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