Your alternator is shot. The bean dust and moisture more than likely did it in. I rarely get more than a year or so out of an alternator on the JD 6620s. Heavy load and terrible operating environment. IF you replace it or have it rebuilt, make sure it is the correct amperage. The combines use a higher amperage on than most of the tractors. The correct one will keep up with the draw of all the systems.
The automatic header is voltage sensitive because the solenoid coils have to activate the hydraulic valves. With low voltage they will not be strong enough to do that. This is also why your side hill did not level.
Now STOP running the machine with the bad alternator!!!!!!!! The lower voltage drives UP the amperage required to make things work. You can damage the solenoids and or coils in the side hill leveling system and the automatic header control. They get much hotter with low voltage.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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