Join Date: Mar 2006
Location: New England
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How are the positive terminals connected?? Did you want separate house and starting banks, or one large house bank. By having the batteries in parallel, as you say they are, you don't have two banks, but a single bank.
If what you want is one large bank, then the two positive terminals will also be connected via a short cable, if these are supposed to be connected in parallel... as you say. Then another cable should run to one side of the battery switch. The battery switch will then only work in that bank position or the both position, but not the other bank position... since there isn't another bank.
However, if you want two separate banks, then they should not be wired in parallel, and each battery's positive terminal will run to one side of the the main battery switch—giving you two banks, of a single battery each.
It sounds like the batteries are connected individually, not in parallel, and that you have two banks. However, unless you have a battery combiner... only the bank that is actively selected on the battery switch will charge if the battery switch is not in the "both" position. That is probably why the second battery sounded like it wasn't charged as fully as the first battery, as it isn't be charged when the engine is running...and may be supporting the loads of the house bank as well.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Last edited by sailingdog; 05-27-2007 at 10:58 PM.