First I wonder why do you have a low and high charge switch as well as a voltage regulator? A voltage regulator is meant to do away with the high / low switch arrangement I believe. As you say, the H4 magneto has nothing to do with the charging system.
You should check the brushes and commutator in the generator first. Be sure they are all clean and that the brushes are making good contact. Check that the regulator points are clean. If everything looks good, with no burn contacts or burn marks in the regulator and you still have problems you need to start doing some more technical tests. I think JohnT is the man with the right information for Delco equipment and his trouble shooting list is available on this forum.
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