I believe it was completely arbitrary. Electron flow is from negative to positive - electrons are the charged particles - charged negatively - they "flow" towards the lack of negative charge on the positive side -
So positive ground might have sounded like a logical choice.
(however current flows from positive to negative... so..)
The bottom line is - it really doesn't matter.
I think auto/tractor manufactureres happened to chose positive - other electronic manufacturers happened to chose negative. The two had very little to do with eachother in the beginning, and no need to worry about standards when they started out.
I would suspect (but I do not KNOW) that it was the radio that probably prompted the change to a negative ground in the auto world (which would carry over to the tractor world) - I would assume that's when the auto world really merged together with the electronics world.
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