Beest I've found says it was company custom that chose the ground. Some makers were positive ground, some were negative ground in the 6 volt days.
Some of the arguments were based on corrosion from experiences with water and sewer pipes along electric RR, trouble with that argument is, the corrosion or erosion problem depends which end of the circuit it is. The direction of current is opposite from the pipe far from the power house as it is close to the power house.
Fact is either polarity worked. But confused people and with solid state electronics it was more bother to make dual polarity radios but I've owned some so it wasn't impossible. Two way radios were made first and longest with reversible polarities both tube and solid state.
I think eventually SAE set a standard and the auto and tractor makers followed the standard which simplified training of mechanics.
But then there were the JD diesels with a +12 and a -12 pair of load circuits to allow 24 volt charging and starting.
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