Well that just blows the diode theory right out of the water...
A diode is an electronic device that acts like a check valve, and only allows electricity to flow in one direction.
On a normal 3-wire alternator, you need to run an extra wire from the ignition switch to one of the terminals on the alternator to provide electricity to "excite" the alternator and make it start charging. This is the line that usually goes to the idiot light on your car's dashboard.
If you don't put a diode in this line, the generator will push electricty back through this line to the ignition switch. Since the coil and alternator excite wire are tied together on one terminal of the switch, the electricity goes straight from the alternator to the coil, and keeps the engine running.
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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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