Tonight's pre-sail inspection of our lights revealed that neither our anchor light nor our tri light (a light used under sail power) was working. One can get by without the later, but the former is very important when you are spending the night on the hook (at anchor in the middle of nowhere).
I whipped out my multi-meter and I can see that the fuse box terminals and the base of the mast has power for these lights, yet they are still not on. This means that we will need to shimmy up the mast and inspect the unit at the very tip top. That event will have to wait until the morning.
Such is the life of voyagers!