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Old 05-16-2013, 01:50 AM   #5
twistedtree
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City: Vermont
Join Date: Jan 2013
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Somewhere there is a short between the line and ground, probably on the boat. I say "probably" because these things can be very elusive, so it's good to never dismiss possibilities.

As a first step, I'd unplug the shore power cord and measure the impedance between the various plug pins that make up the shore power inlet.

Is this a 120V boat (i.e. a 30A inlet), or 240V (i.e. 50A inlet)?

When you measure, the line to neutral, and line to ground measurements should be open circuit. Try it with different combinations of breakers on/off as you did before.

If that checks out, then I'd take a look at the marina power, or better yet get the marina to look at the marina power.
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