In a genny the field shoes have residual magnetism in them that allows the genny to charge when turning. The field circuit will show 3-4 volts with the regulator disconnected on an A type circuit.
In an alternator the rotor contains the residual magnetism which with a special regulator which feeds that residual magnetism back into the rotor windings makes the alternator charge without external excitation. I have modified a couple for slow speed tractor engines, the alternator being the Delco 10SI.
This is not done with the standard 1 wire alternator regulator. The regulator used is a D10AC used for the 10SI. It involves removing the diode trio and adding internal wiring to take AC voltage from the rectifier bridge and feeding the rotor from there which the regulator controls all internal.
I have one I did for my 830 Case diesel and it starts charging as soon as the engine is running , no rev up to initiate the charge.
Research he D10AC regulator online, you will se the regulators with internal jumpers.
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