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 - Pitfalls of Tractor Engine Rebuilds - by Chris Pratt. The first pop after you have put the machine together with your own hands is exciting and pleasing. The whole experience can be marred if one moves too fast and makes too many assumptions that they can just use "as is" some parts they should be closely scrutinizing and possibly attended to. In such cases, rework makes what could have been a fun project turn into an irritant or even a nightmare. Minor Irritants To give you an example of an minor but irritating proble
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