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I have no voltage whatsoever at any of the yellow wires tested at the re/reg plug either yellow to yellow, or yellow to earth. Does that mean that the alternator is done. Think it's time to get the alternator cover off and have a look.
Check that the green wire from field coil goes to earth then temporarily connect white to battery positive then disconnected yellow wires should give the ac volts between wires THERE IS NO CONNECTION TO GROUND on this system.If you dont get ac volts chances are the connectors at generator are bad
Thats the thing with electrics, methodical and thought out testing and not just diving in