Boat Buzz

I have a 1968 57' Connie. I've got everything electrical working in this old gal except for the ceiling lights in the galley and the ceiling lights throughout the boat. All electrical plugs are working. I'm assuming all of those overheads are on the same circuit. Any ideas?

of course this could be a broken wire along the trail....but to see which are on what circuit...I would try to see if the Mariner's Museum has the wiring diagram …. John in Va.