Doess the tractor have a magneto or battery ignition? This is important because it probably came originally with a magneto, if so the ignition switch grounds the points on the magneto to shut it off. If it was later converted to a battery ignition the switch would need to provide power to the coil, which the original would not do. It's possible that someone avoided buying a new switch by using the original light switch to provide power to the coil, thus needing to be in the "B"(bright) or "D"(dim) position to run. The "L"(low) or "H"(high) charge positions do not provide power to the lights, rather ground the field terminal of the generator. In the "L" position the field is grounded thru a resisitor which results in a low rate of charge, the "H" position grounds the field directly resulting in a higher charging rate. Neither "L" or "H" powers the lights, and if the coil is wired to the light terminal the tractor won't run. This is a bit hard to explain in text, but may explain your problem.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I’m handing him tools and he says, "give me that..." and I’ve already got it in his hand or "hand me that....."and I’ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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