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Were the old ones six or twelve volts each? If six, they would be wired in series to get 12 out. If they were twelve, they must be wired in parallel to still have 12 out - unless your coach needs 24v, which I doubt.
2010 Montana 3665RE, wet bolts, etc.
2006 Ford F350 Diesel Dually, air bags, Softopper, Aeroshild, etc.
What Walt said, in Series doubles your voltage, if you bought 2 12volt marine batteries and you wire them in series you are probably gonna end up with problems. Parallel would still be 12volt with more storage.
I totally agree! With2 12V batteries you keep voltage the same, but double the available amperage. With 2 6V batteries you double the voltage, but keep the amperage of only one battery.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy