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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Today's Featured Article - George's Fordson Major - by Anthony West (UK). This is a bit of a technical info to add on to the article about George's Major in the "A Towny Goes Plowing" article. George bought his Major from a an implement sale about 18 years ago for £200.00. There is no known history regarding its origins or what service it had done, but the following work was undertaken by Harold alone to bring it up to show standard. From the engine number, it was found that the major was produced late 19
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