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 - Tractor Profile: Ferguson TO-20 - by Staff. When the infamous "Handshake Agreement" between Henry Ford and Harry Ferguson fell by the wayside (that's a story in itself), Harry Ferguson quickly set up manufacturing plants for a United States version of his English TE-20. The TO-20 was relatively the same as the TE-20 except utilized some different casting materials and had a US-style electrical system. The TO-20 was a dead ringer for the Ford 9N and 2N models and they say that Ferguson did this on purpose when the Handshake Agreement wen
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