Paul,
You could make up a temporary test wire to check the alternator ground with a 3 foot or longer piece of 14 gauge primary wire. Crimp an alligator clamp on each end. Clip one end to a good unpainted ground, say one of the upper strut mounting bolts, and clip the other alligator clamp to one of the alternator through bolts. Check the charging voltage at various times over the next few days. This should tell you if your original alternator ground wire is part of the problem.
Hope this helps.
Andrew
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