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Dispose of the 6v batts wired to the starting battery, don't change anything else until you follow Cam's advice, use the spread sheet to figure your needs.
If you decide to go with one bank, do NOT try and save money by putting new batteries in with your current batteries - all batteries in a bank need to be the same type and the same age. Not doing so will seriously degrade the life expectancy of your new batteries.
Save yourself a lot of time and money in the future by investing a few dollars and a couple hours each winter weekend to reading Nigel Calder and Don Casey; you don't own your boat until you can take it apart and put it back together again - better than it was.
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