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 - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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