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 - It's Alright Where It Is! - by Anthony West. I have a tale of a different kind to tell. Whilst rooting in the hedge bottoms this week I had cause to visit Chapel lane Farm, the home of an eccentric gentleman by the name of Austin Kendall. I had heard rumours that an old Case Model C was languishing away in the back of one of the outbuildings there. So off I went in search of what would turn out to be a very rare and unusual tractor. Mr Kendall is an excitable chap to say the least. He is amongst the last of a dying breed of farmer who
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