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 - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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