Originally Posted by Ohiobrits
For an FB (if that is what you have, remove the mattress and unscrew the forward section of plywood. Access is improved quite a bit then. The cable comes up through the floor and is sealed with black sealant - you will need to carefully dig it out to get the new cable through. Not hard but tedious.
I just did mine. Agree, "not hard but tedious". Part was cheap. You'll need a 10' cable for the 25FB like mine. A bit more than 10' like Conntek makes is even better http://a.co/3Tyjz59
The caulk through the floor on mine is gray and hitting the aluminum belly pan so I used Vulkem caulk there.
You'll need ring connectors for 3 different gauge wires (1-10AWG, 1-12AWG, and 4-14AWG). I think the ring size was for an 8-10 stud, not positive. Also you'll need a wire stripper, and a good crimper. Most combo stripper/crimpers tools are crap!