Before the SAE standard J543a the automotive, truck, and tractor world was pretty much evenly split between positive and negative ground, generally by manufacturer. In the 1930s there were arguments put out by the different factions justifying their choices.
Its kind of like which side of the road to drive on. So long as you are alone, either side gets you to your destination safely, but if you have to share it works a whole lot better if all follow the same rule.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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