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 - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
... [Read Article]
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