Alternator regulators work by either grounding the field or supplying voltage to the field. The first thing I'd do is confirm that the alternator doesn't charge when the field wire is removed. If it continues to charge with the field wire open, you've got an internal short in the alternator. Otherwise it must be a problem with the regulator or wiring.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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