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 - Using Your Tractor: Creating a Seed Bed - by Chris Pratt. When I bought my first old tractor, I had only one idea in mind. It wasn't the preservation of old iron since at that time, I was unaware that people even did this. It wasn't to show off my restoration skills (though I had tried my hand at a couple of old motorcycles in my teens and if I recall correctly, those old motorcycles were sold in boxes about one quarter finished). It wasn't to relive memories of Grampa, Dad or myself out on the back 40 nursing the Farmall pulling too many b
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