There really isn't any bypass wire on this tractor but rather the resistance wire is bypassed. The power comes from the key switch through the multi connecter under the dash near the voltage regulator. The next piece of wire is the resistor which is crimped into the same connector at the solenoid with the wire that goes to the coil. The by pass is the I terminal on the solenoid. When the starter is engaged the I terminal is energized internally from the battery cable contact which provides cranking voltage to coil leaving equal voltage on each end of the resistance wire. When the solenoid is de-energized the current again comes through the key switch through the resistance wire to the coil.
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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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