MB GPW voltage regulator, INTERNALS, 6 or 12 volt
stock configuration, "B" circuit charging system only
Joe's Motor Pool produced Regulator for Ford GPW, Willys MB Slat Grill & MB Models. Inside the regulator is a switch to convert 6 volt to 12 volt. All internals are an updated modern version to the classic Regulator.
installation video
https://youtu.be/gWBTGFREBs0?t=47