Well, in a way, it might as well been "rocket science." That split system confused a lot of people, including some tech guys at Deere Co. We were sent to winter service schools ad nauseum for many years because of all the problems associated with the system (functional and service related). I spoke with a few Deere instructors who did not even understand what they were teaching. I suspect part of the problem was that Deere Co. did not design it (they hired out for the unique design). I still don't understand why they didn't just use a conventional 24 volt system like Allis Charmers did. A groundless isolated starter is near impossible to keep isolated. Brush dust screws it up and creates a path to ground.
As to factory wiring diagrams - they certainly reflect what was used at that time of production, and may or may not reflect changes made later. Last Deere place I worked at, we had Deere tech bulletins stuffed in many of the original books for tractors with 12-12-24 systems. Especailly the 3020s and 4020s.
I have to confess though, we never had a two cylinder diesel in our shop any larger than a 720. No 820s twos around here in my part of NY. 820 fours, yes.
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