Lack of red wires
Mark,Thanks, although I'm trying to avoid the "elder" in elderstatesman. I'm happy to hear that you are less concerned about the immersion issue, that should simplify things.You did mention some minor corrosion. You might want to look at that closely. Sometimes untinned wire finds its way into boats and if so, it would probably show up first as corrosion on the exposed leads.Given the lack of red wires in the primary battery wiring, take a look at your battery and see what color wire is hooked to the positive terminal. It may well be black, even though this would not be the preferred method of wiring. If so, or any other color besides red, I advise that you mark the ends of any positive post wire with red tape until such time as you might decide to replace the wires. You need to follow this wire to your battery switch (we are assuming you have one) and then on to the DC panel. Again if any color other than red, mark with red tape near the ends. Doing this will make it more clear what goes where and just might prevent you from creating a dead short sometime and those associated blue sparks, not to mention heat or a fire.Sometimes it is easier to follow the wire if you have two people. If not, you can do it with a meter. Leave the positive post wire hooked up and disconnect the suspected other end from the battery switch (again, we are assuming that exists) or wherever you think it runs to. Then set your voltage meter at an appropriate scale to read 12 volts DC and place the black probe on an appropriate ground and the red probe onto the end of the suspected and disconnected wire. If it reads 12 volts or in that general neighborhood you know only two things at this point. These are that the wire you are attached to has voltage from the battery and you have found a ground connection that is continuous back to the negative terminal of the battery. You do not yet know that the wire end on the disconnected side is the same continuous wire that is hooked to the battery on the other side, although with a one battery system, that is likely. The only way to verify that it is a continuous run (without an intermediate splice, terminal, or branch) is to trace it. As I said earlier, sometimes two people help in that you can have someone tug on it from one side of a conduit or chase area while you feel for the same movement on the other side. If you can verify that movement and there are no other wires eminating from that area that you can't account for, you probably know you do not have a hidden problem. It's a little tedious. You might also take some masking tape that you can write on and mark the wires as you trace them. Should not take too long before you are able to diagram where everything is running.As I said in the earlier post, sometimes people go out and buy a bunch of black heavy gauge wire and just start hooking things up. Sometimes one color might be unavailable. DC current does not know or care about the color of the wire it runs in, but it does know how to find a direct path to ground. We are the ones who are concerned about color and making sure there is no "direct" path to ground.I use to build homes, now I just handle real estate transactions. My knowledge of wood is better versed in framing lumber than finish hard or softwoods that might be used in a boat. I would imagine any lumber that is somewhat resistant to higher humidity dry rot might be appropriate.The only concern I have about T&G would be related to future access to the bottom of any through deck hardware attachments. For example, I have a life raft mounted and I know I'll have to access the backing and nuts again at some point. Getting through T&G would be pretty rough unless you made provisions for those accesses during the install.My newer Hunters have the vinyl fabric headliners that are stretch mounted. I'm sure it makes production sense, but I have not decided what I might need to do someday when it gets damaged or just need replacement. I also have those molded plastic panels in various locations on the boat. I figure someday those will age, crack, etc. At that point in time, I may have to remodel my first boat and I always hated remodels. And my cabinet building skills fall somewhere between sucks and barely adequate from a quality standpoint. I always hired people who had the equipment, skill and patience for that kind of work. Maybe that won't happen until I'm retired and have little else to concentrate on.Let us know what you find regarding the existence of a battery switch, wire colors from the battery, etc. John gave you a pretty good run down on what to hunt for, just don't assume that the wire colors will be correct. As I said before, if you have a digital camera, you might want to snap a few pictures. Loaded with some of that basic information you will find plenty of help here. I think some of us like solving the mysteries that get posted here.Dan Jonas (S/V Feije II)