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 - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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