low/no charging

If you replace the alternator, try to get one from a mid '70's car, known as a "squareback"

Your original should look something like the right hand side, which you do NOT want, unless you want "restored correctly" look. The later "square back" is a better alternator



You can either do one of two things with the later alternator (two field connections)

Either ground one field and hook up your original regulator.......

Or add one more wire and wire up a 70/ later regulator