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 - A Belt Pulley? Really Doing Something? - by Chris Pratt. Belt Pulleys! Most of us conjure up a picture of a massive thresher with a wide belt lazily arching to a tractor 35 feet away throwing a cloud of dust, straw and grain, and while nostalgic, not too practical a method of using our tractors. While this may have been the bread and butter of the belt work in the past (since this is what made the money on many farms), the smaller tasks may have been and still can be its real claim to fame. The thresher would bring in the harvest (and income) once a y
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