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 - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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