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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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