I went through a similar problem with my 4100. Constant dead batteries and voltage tests appeared like it was not charging. What it turned out to be was a small timer located at the front of the tractor near the radiator. This timer controls the heating of the glow plugs. What was happening was the timer was keeping the glow plugs on all of the time. It would then discharge the battery. What I did was unplug this timer. To heat the glow plugs without this timer what you now do is put the tractor in gear and heat the plugs like you normally would. Tractor must now be in gear for the glow plugs to heat. I suggest you google this for a better description of what this timer looks like and its function. Hope this helps.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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