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 - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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