Electrical issue

I did look for them, but I did not see any. Once the wires leave the battery box they are in a protective sleeve and trying to follow all of that wiring is next to impossible. I did jump the wires (two large red wires) to a empty post that showed positive. Everything worked great in the motorhome like it used to. The water pump worked, lights, water heater, etc.. I had full power to the fuse box. I am wondering if the one post on the board has gone bad. I checked the board for the chassis side which looks almost identicle and they are all positive. Anyone ever heard of one post going bad? Are these circuit type boards on the back? I may just wire in a jump wire with an inline fuse and see how that works. I would like to move these two wires to a positive terminal on the same board, but I am reluctant to do so without input from someone who already has done that. If I use a jumper wire with an inline fuse does anyone have input on what size of fuse to use? I did notice that when I turned my battery coach switch to store it cut the power to everything, even my jumped cables.