Mystery wire help.

[bmiller]

My 27 is an 86, has the original electric panel, no 110 circuits just 12volt. I've named all but one of the 10 circuits, the 5th from the left is a mystery. It is a blue wire that goes along the port side, under the hanging locker then disappears into the compression post. My best guess is this was the original anchor light wire. The previous owner converted to a tabernacal mast base and I think changed the wiring. Did the original anchor light wire go up the post into the bottom of the mast? My boat has a plug off to the side of the mast base, is that not original?
I'm hoping that is what it is, that now extra circuit would be a great place for an Engel 12volt fridge.

[Catalina9405]

I have an '88 so different panel with AC and DC.  The anchor light is wired through the compression post with a plug inside the mast step.  I believe they were all done this way.

Chad