The switch is needed because there is no voltage regulator the system just has a cutout relay, the cutoff is open when the engine isn't running to prevent the back feed from the battery trying to motorize the generator. Witch the engine running the generator producing enough voltage to close the cutout so now the generator can charge the battery but there is no regulator and no way to ground the field the switch has a resistor that acts like a regulator and only allows the generator to produce about 5 amps pulling the switch all the way out by-pass's the resistor and the field is fully grounded causing the generator to produce about 15 amps. This is way to much for running all day will boil the battery and over work the generator. It makes no difference if lights are installed or not used
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Today's Featured Article - Updatin The Charging System of Your Older Tractor - by Tyler Woods. Older tractors have externally regulated generators or externally regulated alternators, in some instances. That means there is one device that turns energy from the fan belt into electrical energy,
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