A tractor from that model year will have a generator unless it was replaced with an alternator at sometime in it's life. If it has a generator it could be the field terminal is grounded to the frame somehow. If the field terminal on the generator is shorted to the frame the generator will run wild and put out way too much voltage. If the lights are turned on the excess voltage will blow them out. They get real bright and then poof.
Check the wires going to the voltage regulator. The 'F' terminal on the regulator should have a wire going to the 'F' terminal on the generator. The 'A' terminal on the regulator should go to the 'A' terminal on the generator and the 'B' or 'BATT' terminal on the regulator goes to the ammeter and should be hot at all times. Sometimes the regulator has a 'L' or 'LOAD' terminal that has a wire going out to feed the lights. None of these wires should have bare spots touching the frame. Let us know what you find. Jim
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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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