My M17 (1976) had a wire like that (embedded in the cabin overhead). If I recall correctly, it ran forward to the aft edge of the forward hatch, followed that edge a bit and then emerged to be connected to a thru-deck connector in the vicinity of the mast step. In my case, I believe it was used for an anchor light. ----- Original Message ----- From: "Jazzy" <jazzydaze@gmail.com> To: "For and about Montgomery Sailboats" <montgomery_boats@mailman.xmission.com> Sent: Thursday, January 28, 2016 9:16:08 PM Subject: M_Boats: Where does this wire end? https://www.dropbox.com/s/he3d0wj5fm3ayno/20160128_174720.jpg?dl=0 Your looking from the v berth out towards the companion way at the "ceiling" over the sink...the blue and green wire that feeds that little bus bar goes into the fiberglass there. I can't for the life of me find the other end. The little bus bar is unpowered at the moment and the blue/green feeds it. On a positive note...stern light is now working from panel for the first time in forever like the nav light! Whoohooo! Jazz