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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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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