You can safely use a 12 volt jump on a regular H that has the starter switch remotely mounted on the light bar but do it directly at the starter and DO NOT push the starter button. Use the jumper cables as your switch by connecting directly to starter with one cable and last cable to frame of tractor to energize starter. This will in no way apply voltage to the six volt system on the tractor. NOW, on the super H with starter switch on the starter, if you hook 12 volts to that you are impressing that voltage onto the six volt battery. Some guys do this but it is definently not good and I would never do it that way.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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