I had the same issue on my 1981 C30. Turns out my bad wiring also powers the cabin lighting and flows clockwise around the boat from the galley light & ends above the nav table with your nav lights on the bow in the middle. If you have wiring issues upstream, you'd notice that in your cabin lights (especially in the V-berth, as it's on either side of the bow lights). So if all your cabin lights work, it's an issue with your bow lights, if youu're cabin lights don't work either, the issue is elsewhere. I had the wiring diagram, but alas, can't seem to find it.Check the catalina 30 website for the systems diagrams. My issue wasup at the head light & didn't work from there clockwise...Fix? since the run made it's way back around to just above the electrical panel, I simply ran a 2' (fused) wire into the nonworking light above the nav table & voila! all the cabin lights (including bow lights) worked! If I find the wiring diagram I'll post as it would surely help. Good luck!
