OK, since this thread is about mystery switches, I've got to tell you of mine.
When we bought the boat - about 12 years ago - there were two air
horns conveniently located on the side of the cockpit coaming - lurking there reminding us of how much knees and shins can hurt. We couldn't make them work - cause there was no button. So we looked, and traced the wires, which disappeared into a large bundle of wires and through a hole in a bulkhead which was pretty much inaccessible.
Anywhat, months later, when Saltwater Suzi was cleaning she discovered a button below and behind the companionway steps. She said,"I wonder what this could be?" And she pressed it. Of course, nothing happened. But upon tracing the wires, using mysterious electrical devices known only to very accomplished electricians (available at
Radio Shack for $24.88 on sale), we discovered it was the horn button. You probably had guessed that - I need to work on my suspense thriller writing technique.
Of course, like most everything else on the boat - it didn't work but we puzzle, to this day, over the logic that impelled the installer to locate the horn button in a position where you, quite literally, must get onto your hands and knees and use a flashlight to even see.
You guys' boats have P.O.S? (Previous owner syndrome) Stories? - Oh, I could tell you stories.