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 - The Rescue of a Fordson F - by Anthony West. Introduction I live in the UK and have for many years restored Fordson tractors (in the main model N's). I have also restored and shown model F's, E 27N's, Field Marshall Series 2, David Brown Cropmasters and the old rey Fergeson T 20. At one time I had seven restored examples which were shown and used in ploughing matches. As most restorers, I have a number of war stories I can relate on a range of topics that may help other like minded and interested people. Perhaps my first p
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