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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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