A pal was fitting my 8 channel RC switching unit into his boat to be able to individually control lots of different lights in the superstructure - nav lights, cabin lights white, cabin lights red, deck lights, spotlights plus radar scanner motor - faced with the huge number of wires he was asking me about suitable connectors.
As the LEDs and motor could all be run from 5v, I suggested he mount the switching unit in the superstructure where all its outlets are situated and then the only connection from hull to superstructure is a 3 way servo lead from the receiver, which (if suitably long) can be connected/disconnected at the switcher itself. For the 5v LED supply, the switcher unit has provision to solder in a link which connects the 5v from the receiver to the switcher common positive rail (individual channels are switched to 0v)
Www.forge-electronics.co.uk/index.php/boats/8-channel-rc-switch