Are the batteries hooked in series or parallel? I know John Deere was big on hooking two six volts up together to make them 12 volts. Cat also did it with two 12 volt batteries. Are your positives hooked together or is one positive to the opposite batteries neg post? If the later is true they are hooked in series. This would mean you are running a 12 volt system and you should be charging/starting with 12 volts.
With all that said, you can cheat and use 12 volts to turn a 6 volt starter. You can't over crank it or you will burn up the starter in a hurry.
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Today's Featured Article - When Push Comes to Shove - by Dave Patterson. When I was a “kid” (still am to a deree) about two I guess, my parents couldn’t find me one day. They were horrified (we lived by the railroad), my mother thought the worst: "He’s been run over by a train, he’s gone forever!" Where did they find me? Perched up on the seat of the tractor. I’d probably plowed about 3000 acres (in my head anyway) by the time they found me. This is where my love for tractors started and has only gotten worse in my tender 50 yrs on this “green planet”. I’m par
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