On my 2005 27 Islander I replaced the passenger side outlet with a new one. The connections are good. The Captain's side works perfectly. The fuse shows 12 v accessory--fuse is good. I assume this is the only fuse. What am I missing :?: ????
I would review the wiring diagram for the boat if you have or could obtain from GW Cust Serv. But before digging in too deep, I'd see if you can get to the back of the 12v outlet. Maybe a wire is loose or disconnected. If ok, chase back and check for voltage along the way.