I need to replace the 4 Pos (Off, 1, 2, Both) selector switch in my 1994 22 Ft. C-Dory. I have twin Honda BF-45's (1994). I don't know if the current switch has the alternator disconnect feature or not. Do I need it, what does it do? I use two Marine Batteries and currently don't distinguish between Starting and House functions. I know I should, according to the things I have read, have one Starting and one House but don't. The batteries are only one year old, will replace them eventually.