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 - Women and Tractors - More Views From the Farmer's Wife - by Teri Burkholder. The top ten reasons why the judges wouldn't let you participate in the stock antique tractor pull: Hey, this is stock! It came with that V8 in it! That "R" on my tires stands for "really old" not radial! Blue gas? We thought it was a pretty color! What wire hooked to my throttle?
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