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[quote="Fuzzdr" pid='10455' dateline='1531049228']
Re; loose neutral in the 50 amp receptacle- another voltmeter check revealed an ultra short flashing of 120vac, but nothing strong or sustained. To me this points to a loose neutral connection. On my initial voltmeter check days ago, there was not any trace of a neutral.
My next move was to hook a Marinco Reverse Y Connector to 2 dockside 30 amp receptacles (containing both L1 and L2). The result was the same; 240 vac into the boat but no 120 at all which surprised me??
My next  plan was to hook the 2 30 amp lines directly to the 2 30 amp receptacles on my boat. But wait, when I lifted the cap on one of these, there was no 30 amp inlet- only a female port for coaxial cable and obviously audio/video  and some other small port that I did not recognize. So I did the only thing left- ie; connect a single 30 amp line to my single 30 amp receptacle. Now I had 120 vac which ran my Acs and battery chargers (which seem to run on either 120 or 240 volts depending on what is available. But no power to my refrigerator, freezer or outlets. As for the outlets, I may have a GFI problem. No breakers are off so I am not sure about the lack of 120 volts.
Does anyone know why my Reverse Y Connector is providing 240 but no 120 vac??
From the beginning, the marina owner has insisted the lack of 120 when plugged into his 50 amp box is due to my big cord connector being defective. It has a little black tape on it which is not pretty but this has not stopped it from working perfectly at many other marinas. For no good logical reason other than the fact that I do own a brand new replacement plug, I did replace the 50 amp boat side plug. Everything was good inside the old plug as I knew it would be so now the new one is installed. No change, no 120 from that 50 amp shorepower box. Guess what the guy has a loose neutral somewhere in his line.  Fuzzdr


So you really do only have one 30 amp connection on your boat like mine.  All of the loads on my boat are 120 volt.  When there is only one 30 amp circuit available I have to manage my loads.  When there are two available, I use a reverse y smart splitter an the 50 amp cable  ( I do not have the glendenning retractable)  When there is a 50 amp 125/250 volt available I use that.

Prove to yourself that you have continuity on your 50 amp cord.  Reel it out and take the male end down to the panel.  our should be able to ring out all the wire behind the panel.


One more thing, when you say you have 240 volts but not 120, do you mean on the meter? It will say 240 when you are plugged into the 50 or on generator, it will say 120 when plugged into 30 amp.

As to what you are seeing when plugged into the 30 amp: I believe that when plugged in 30 amp, L1 and L2 are paralleled on the boat. The fact that half your load work o your boat lead me to believe that you have a bad neutral connection on one side of the panel.  the confusing thing is that you said the boat works in other marinas.

Make sure the marina plug in actually 50 amp 125/250v. There is such a thing as a 50 amp 250v, the plug is slightly different but will fit if you force it.