Thank you for your suggestions.
hellosailor, I've already got "the 12 volt doctor", by tomorrow morning I'll have a PhD in Sailboats Electric Systems and I will start working on the wiring diagram.
mitiempo, I will look into that battery grouping, but first I need to check what type they are. funny thing you mention the bilge pump, the boat doesn't have an automatic one, just a manual whale pump in the cockpit.
Is this bad? Very bad? For the rest of this fall I will do a few day sails. Next year I plan on going all the way around Long Island, and then up and down the coast, from New York City. Should I install an electric bilge pump? Two years ago I passed through Victoria Harbour on my way to the Desolation Sound. Great places. I hope to come again sometime...
Stillraining, I will.