Step one, power thru the bulkhead.No it's not on fire,just the Glow light telling you it's ALIVE !

Step 2, wired power strip to the backside of inlet plug(upper left). Now I have a 15 amp resettable breaker, and an on/off indicator switch/light. My dock outlet is already GFCI.

Battery tender dual charger, direct wired to A and B batteries.Mounted under sink left wall behind seat