Scott -- I had a variation on the blue wire problem Chris mentioned. The blue wire in my car had broken and been repaired with a solder joint. Over time the solder joint deteriorated increasing the resistance in the wire. Because of this increased resistance, the voltage flowing to the alternator was decreased and the alternator pumped out more juice in response to this erroneous signal. Fried both my battery and the diodes in my alternator, but thankfully nothing else in the car.