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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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