On my Eagle shell the power cable to the truck is just drilled through the plywood camper base. The inside portion along with the rest of the electrical stuff is inside the bench on the driver side. I assume if the camper is built with cabinets then that stuff reside roughly in the same area just inside the cabinets.
On my camper this carpeted shelf opens up exposing a 6"x6" space that houses the electrical stuff. From inside you can see where the cables penetrate the plywood at the front.
Bass Pro Shops sells the Marinco trolling motor connectors. Any marine place should have high quality battery cable and connectors.
Your setup may be completly different. Just showing how they did mine. Hope this helps.
Edited by Squatch, 27 March 2015 - 06:49 PM.