OK, you can STILL figure this out. Get "the numbers" off the generator and regulator. One or both will tell you 6/12V, and the regulator no. MAY tell you neg/ pos ground. I say "may" because some replacement regulators were built for either.
Try to find anything that will provide a 12V load--that should give you something for the ammeter to "work with" so you can determine polarity.
If the part no. for the regulator is for EITHER polarity, in the end you can use whichever ground you want, and just repolarize the generator, and then swap terminals on the ammeter
This is why I'm going to hell. I've made a deal with the devil, that when I get down there, I'll be in charge of all the engineers--you know, the ones who couldn't "standardize" this kind of stuff. Worse yet, there exist some old 12V trucks that are positive ground. Who thought THAT was a good idea? We SHOULD have gone the way of aircraft--28V
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