(quoted from post at 20:42:48 10/17/18)
(quoted from post at 09:03:43 10/17/18) The 600/800 Series, built 1955-1957, used the 6V/POS GRN Electrical System. The 6V generator used a Voltage Regulator. The '01' Series were built 1957-1962. I am unsure when they went to the 12V generator but believe they also used a VR.
Tim *PloughNman* Daley(MI)
The '01 series and 4 cylinder 2000/4000 series gasoline engine models all had 6 volt positive ground systems from the factory. The diesel models of those series all had 12volt systems with a generator and eternal Voltage Regulator from the factory, and I think, but I'm not 100% sure, that those 12 volt diesels were positive ground.
The 1965-1974 2000/3000/4000/5000 series all had 12 volt negative ground systems with a generator and an external VR.
The 7000 series was the first, I believe to use an alternator, but they still had an external VR, as did the 1975 + x600 series.
I think it was the xx30 series where they started to use alternators with internal VR's.