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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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