[Fuzzdr]

I have a new-to-me Tiara 4000 Express 1997. The owner at my marina is blaming my boat/power cord for an electrical problem when my large cord is attached to his 50 amp receptacle. When that cord is attached, I have 240vac supply to my boat but no 120vac supply at all.
Using my voltmeter at his female receptacle, as expected both L1 and L2 are hot continuously. But the white neutral conductor cavity shows no continuity to the neutral bus in his power panel.....which is what I expected all things considered. Not sure if his ground is properly functioning or not. There are no breakers to be seen anywhere in the area for emergency shutoff. I have installed several 400 amp services in residences and small to medium sized businesses. I feel confident in my understanding of basic wiring principals and procedures. I am trained to be a medical doctor not an electrician however. Further on the way to this marina, I stopped overnight at no less than 5 other marinas. When plugged into 50 amp shore power there, I enjoyed full power for both 240 and 120 volts.

I am writing to find out about getting my power from 2 30 amp receptacles rather that the single 50 amp one. The nearest pedestal to me has +120 hot on one receptacle and -120 hot on the adjacent receptacle. ie; 240 vac across the pair. And 120 vac when either L1 or L2 is tested with the white neutral wire. So it seems that I should have everything to provide full power to my boat. My boat has a pair of 30 amp receptacles in addition to the 50 amp retracting cord. What I don't know is how my Tiara handles the power entering through my pair of 30 amp receptacles. I need to be sure I have 240 vac to run AC and battery chargers. Will I need to use a Reverse Y Connector?
Fuzzdr