The nomenclature for the small case delco externally regulated alternators is 10DN. I got mine two years ago at an alternator repair shop in Bellingham Washington for $75 IIRC. That did not include the regulator. I just googled Delco 10DN and I don't see any that cheap right now. Here's a hit for $114. An auto wrecking yard would be another source. There were a lot of those alternators built.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.