I have several light fixtures in my salon that are not working. They used to work when I first purchased the boat 2 years ago. They all work off of the same light switch (3-way). Now 3 of them work and 2 of them do not. I've tried replacing the halogen bulbs but still nothing works. I've taken the good fixtures and switched them over to the problem fixture and the good fixture will not work in that spot either. Appears as though I have no 12 VDC going to these fixtures but I have no idea how I would have lost this voltage supply and/or how to trace the wiring back to the DC panel. Any ideas?