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post #9 of Old 05-31-2013 Thread Starter
rmeador
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Re: Shore GFCI trips when plugging in boat

I do have an oscilloscope (and a logic analyzer, not that it's useful for this -- I'm an electrical engineer!). Are you suggesting that the absence of a voltage between ground and neutral will indicate a ground fault? I can't quite figure out what you're getting at. There is always a voltage present between those two lines any time a circuit is under load due to the resistance in the wires. Any other boats on my dock drawing power will result in me seeing that voltage even if I am not drawing anything. I suppose if those lines are shorted inside my boat, I might not see a voltage. Or do you mean when inverting only (no shore power)?

1979 Gulfstar 37 Laissez Faire
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