Negative ground simplifies alternator and radio stocking. Solid state regulators, rectifiers, and radios absolutely can't tolerate reversed voltage for even a microsecond. "Lets the smoke out." Burns things to a crisp inside the solid state devices, sometimes outside.
Before the negative ground situation became SOP, radios often came with polarity switching plugs, whether for broadcast or two way.
Certainly using both polarities on different equipment added complication and yet 30 or 40 years (as of 1955) of experience hadn't shown any benefit of positive or negative ground over the other polarity. But to the less experienced person troubleshooting, positive ground causes much confusion, even today. And can get you into deep trouble when jump starting.
In my reading of SAE handbooks, I didn't detect a government requirement, just the results of an SAE study committee. Though in looking on line for J543a, I have come upon government standards relying on it and requiring negative ground.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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