Re: Old wiring help
Looks like your switch panel has inline fuses - mine was the same way. In that case there is not a separate fuse panel. You should have a hot input lead (fused) from the battery end that goes into one end of each switch, then an output (unfused) lead from the other end of each switch that goes to each respective accessory.
Because of the coloring I'm not certain that your fuse panel also buses the negative (ground) leads, though the black lines going into and out of the battery harness makes me inclined to think so. You will have to do some digging - follow the wire from one of your accessories to the fuse panel and see if your negatives go to the panel or to somewhere else.
I had some confusion with the old wiring in my boat as well and ended up redoing the entire thing so that I KNEW it was correct. I'd recommend doing the same thing here - take the whole panel apart, run your new wiring, and rewire it the way you want it. I added in a distribution block with both positive and negative ends, put the fused leads from my switch panel and all of the grounds to the distro block, and ran heavier gauge positive and negative leads back to my battery.
