Went back to the boat
to find no shore power
found the breaker in the isolation transformer had tripped.
Tried to flick back on, but it trips again straight away, this is even the case with the boatís RCD/GFCI shut off.
Does this point to wiring
problem between the isolation transformer and the boatís distribution panel? Or point to an issue shore-side of the transformer?
Or of course is it likely possible itís the transformer itself?