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 - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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