Confused

I am now. So to clarify, you have a box on the jetty? Then you have a cord that connects the jetty box to the AC main panel in your boat? And if I understand correctly, that cord has power at the end of it and this then plugs into a boat recepticle? Sooooo? if I am on track here, there is nothing wrong with shore power, cord to boat recepticle, but there is a problem somewhere between the boat recepticle and your switchboard?? Or do I need to take a lesson in American