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KW, it has two 6 volt batteries connected in series which makes it the 12 volts. Its done that way to provide more stored energy than a smaller single 12 volt battery could provide. Basicaly, the more lead and acid and plates you have, the more stored energy and cranking capacity and the combination of the two batterys usually has more then only a single battery. Sooooo oooo if you wanna use two 12 volt batteries simply wire them in paralell, meaning the + of one to + of other and - to - (side thats grounded to frame assuming youre at - ground???? are you??). I would use 00 Gauge battery and ground and splice/tie cables if I were wiring it. Caution, a single light rated wimpy low CCA or low Amp/hr 12 volt battery would not store as much energy as two heavy rated 6 volt units, so you have to compare apples to apples here. Just because youre at 12 volts using just one battery doesnt mean she has as much cranking power as the two sixes in series. Therefore, if youre gonna use two 12 volt batteries wired in paralell, I would still buy the absolute highest rated most CCA or Amp/hr rated batterys you can physically fit into the battery boxes. I think that would be in like the 1000 to 1250 or more CCA rated types depending on their physical size I WOULD NOT BUY the light duty 500 to 600 CCA units. Dont get cornfused on the charge system wiring, the + of both batterys (they are tied together) wires to the same place the outermost untied + of the two 6 volters wired, and the two - posts (also tied together) is frame ground assuming your at negative ground. John T Nordhoff in Indiana, retired electrical engineer.
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