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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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