Without a warning light, appropriate resistor, or diode in the "excite" circuit, the alternator can charge OUT of the excite terminal, causing the engine to continue to run after the ignition switch is shut off, and/or possibly damaging the diode trio or internal voltage regulator.
A #194 lamp, a 10 Ohm, 10 Watt resistor or a 3 Amp 1000 PIV diode (1N5408) will each serve the same purpose... limit or stop reverse current flow OUT of the "excite terminal".
Also, in the case of a poor or open connection in the charging circuit the alternator will try to pump it's entire output out of the "excite terminal" letting ALL the smoke out of the alternator.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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