John,the JD 30-40-50 series tractors ran two 6V batteries in series, starting with the 55 series, they wired two 12V in parallel. a real common conversion on the 30-40-50 series is to replace the two series wired 6V with a large single 12V in the left battery box and short heavy cables directly to the starter. They usually they pick up 50-100 extra cranking rpm. Removing that 3 ft jumper cable and two cable / post connections, seems to make all the difference. One 1000CCA battery seems to do well in a "summer" tractor, while a pair of them using 4 cables directly to the starter do best for a "winter" tractor that sees long haed cranking during a cold start. Never saw any of them that did not gain by eliminating the series wired double 6V setup.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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