swtrvng4me

hello, I hooked up to new 30amp dock/shore power box.. every time I turn anything on it kicks breaker at dock... changed chords, still the same .. switched to different box on dock and still the same... switch to generator setting, everything works fine... plug into shore setting at home , everything good... even if I just turn on battery charger it goes off immediately.. everything on panel is off.. it does not matter which one is switched on... help please. 1996 275 cruiser..