[ReelMagic]

I'm assuming dockside there are 2-30amp/110 connections. If that's correct you need a reverse "Y" (Marinco part RY504-2-30). For this to work correctly each of the 2 30 amp dockside pedestal connections must be out of phase with each other.... If not the reverse Y adapter will not work.... My 38 Open allows me to use either a 50 amp/125/250 connection (same as you have) or via a second connection a single 30 amp/110 cable... I then turn on the appropriate shore power breakers on my master power panel...Hope this helps...... May be a little confusing if your not aware of how pedestals are wired...