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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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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