Wasn't really necessary until charging systems using semi-conducters came into common public use.
Anything SAE says is just a suggestion from one group, anyway, just like National Electrical Code. Nobody has to take any of their suggestions, unless a locality makes it law. I think some people confuse what is legally mandated, versus what some organization "suggests."
Positive ground is still used in new equipment, as well as some postive ground alternators. Especially in some large marine systems, where there are some benefits to using postive ground over negative.
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Today's Featured Article - Madison's County - by Anthony West. Philip Madison has been a good friend of mine for quite some time. He has patiently suffered my incessant chit chat on the subject of tractors for longer than I care to remember, and on many occasions he has put himself out, dropped what ever it was he was doing, to come and lend a hand cranking handles, or loading a find onto a trailer. Although he himself has never actually owned or restored a tractor, he was always enthusiastic and always around helping with other peoples projects.
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