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 - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
... [Read Article]
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