Any hot rated alt. The issue very likely is the sterling reg is pushing the alternator harder than a Standard automotive reg, and the alt can't handle it. Some smart regs allow you to program max outputs or time...
There are plenty of alts around that will work very well. Balmar
are one of the best known, but very expensive. Just make sure that the manufacturers info states that the one you are interested in is hot rated, and suitable size, voltage, and belt system for you engine
. Sorry, I don't have specific model suggestions, but it's likely someone else here will.
Oh, hot rated means it can put out its rated output indefinitely without overheating! Most automotive alts are not like that.
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