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 - Tractor Profile: Case VA Series - by Staff. V, VC, VI and VO). Althouh the Case VA looked much like the V, it shared no major components with its predecessor. Except for military units, the production of the Case VA was interrupted in July of 1942 due to World War II. It resumed again in 1944 and continued until 1953. It started up briefly later on in 1953 and continued on a very limited basis until 1956. The VA Series included the following models: VA: Fixed front wheel tread VAC:
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