There is a readily available solid state regulator replacement for Ford Model "A" generators.
The "A" generators used a cutout relay only, it is a simple matter to wire in a solid state diode to allow current flow in one direction only, by passing the points.
The following site has a voltage regulator for use with Ford generators. They have either the 6V or 12V options. These are all 3 terminal - case grounded and will work with either Positive or Negative ground systems.
Should be an easy task to remove the internals and place them in the original Owen Dyneto regulator, or locate the new regulator somewhere else and keep the stock regulator for aesthetics.
qualitypowerauto.com/catalog.php?item=142 My two cents - If the original Owen Dyneto regulator is properly rebuilt is works fine.
I had to re-wind the thermal regulator with nichrome wire on mine and it works great.
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