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Beneteaus are wired much differently than most other boats. Instead of a simple 1-2-B switch, they have these two strange red switches, one for each battery bank, and then a common ground switch.
In order to answer the OP questions, he'll have to do a wiring diagram of the boat (start with the factory wiring diagram, then check what is actually ON the boat) and understanding that before making any changes.
There have been a number of good threads here that include wiring diagrams for the more traditional 1-2-B switch and its variations.
There's no need to do #3. I have a Link 2000 which gives me voltage (and a whole lot more) for my two banks, as well as the old analog voltmeter for each individual bank. If you want to, just remove one of the pairs of wires if you have a two bank voltmeter.
As far as #2 is concerned, I would caution you to design a system that allows each bank to start the engine and serve the loads just in case one bank dies catastrophically. Dedicated start engine only reserve banks make little sense. You can do it with switching (multiple switches) or with a simple 1-2-B switch.
Stu Jackson, Catalina 34, 1986, M25 engine, Rocna 10 (22#)
Last edited by Stu Jackson; 05-03-2011 at 05:02 PM.