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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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