Using an external diode has nothing to do with something being wrong with a Delco SI series alternator. A diode is used on the exciter circuit to prevent the alternator from back-feeding and preventing engine shut off. If a three-wire hook-up is used - even with a perfect alternator - a resistor or diode is one way to prevent back-feed. Another way is to use an ignition switch with ACC and IGN terminals. Another way is to wire the excite circuit through an oil pressure switch. Another way it to just install a self-excite regulator and eliminate the exciter circuit.
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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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