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You may know this already, but the best way to wire four 6V batteries into one large bank is to have the positive cable on the + side of battery 1 and the negative bus cable from the - side of battery 4.
The attached diagram is from Magnum Energy's MagnaSine Inverter manual - I hope they don't mind...
This wiring arrangement will insure that current is drawn equally from both 12V-series pairs of batteries, assuming the cables are the same length. If you wire to the positive and negative of, say, the rightmost pair, then those two batteries will always be charged just a little better than the leftmost pair...
1979 Formosa 51 Ketch
Homeport: Marblehead, MA USA
Last edited by jonlgauthier; 04-23-2009 at 06:15 PM.