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Many 6 volt generators had three brushes and were not voltage regulated, but current regulated. So you had to turn on the lights after a while to keep the battery from being overcharged. Which on cars in the 30s made them more noticable in rain and fog in the day time. Those three brush generators are only supplid with a cutout, usually a round can with two connections, one for battery, one for generator armature. A 6 volt generator with a stuck voltage regulator will also put out 15 volts if its turning fast enough. If the field is connected to 6 volts, the armature voltage will be a very good proportional to speed. Double the shaft speed, doubles the voltage. If the generator is self excited, up until the field saturates, the voltage will increase faster than the speed, then will be proportional to the speed. Is there a voltage regulator (3 terminals, rectangular can) or a cut out (2 terminals, round can)? Knowing that will let you know what else to do. The tractor worked OK on 6 volts for nigh on 50 years, with care (fat battery cables and clean connections, and good brushes and bearings in the starter motor) it will run for another 50 without changes so long as you can buy 6 volt batteries. Gerald J.
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