last season both myself and a friend rewired our boats. Mine is an O''Day 22 and his was a C22. The wires in both our boats were such a mess of tangled wires (some even lamp cords) that we both decided that it would be easier to rip them all out and start from scratch. We both bought new fuse panels and I had my brother who is an engineer come up with a new wiring diagram that we used. It took us about 1 days work for each boat except for little things like wiring the mast
lights (which we did before the season started)
It might be easier to do this, than try to figure out what wire went to where...and if the wire is not about to disintergrate from all the years near water, etc., etc.,etc.