NON INVERTER Small Engine Volt Reg Schematic

An ultra high quality soft iron rotor tends to hold residual magnetism. But even then, generator techs always carried a 6 volt lantern battery. Remember them? They had two coil spring terminals on top and they were connected a a pair of wires to flash the field.

I am hoping (praying) these regulators have one or both full wave bridge rectifiers failed and not the power or driver transistor. We shall see.