I feel ignorant asking this, but I'm having trouble understanding the DC wiring on my 323... this is probably made more complicated by the fact that the PO made a couple of wiring "gloms" that make it appear voodoo.
So, one question to start, how are the lights wired on one side of the boat? Is it the positive side of the loop that goes through the breaker panel? Are they wired in serial (seems unlikely to me)? I think if I could understand the specific wiring containing: the battery, a single breaker, and three cabin lights, I could apply that knowledge more generally.
So much for my two years of vocational electronics in high school :/