Generator to Alternator conversion

The issue: We measured 12 volts across the battery both when the car was and was not running, and the GEN light stayed on even when running.

Funny thing. Charles had actually mentioned the possibility of the Generator to Alternator conversion on my Falcon. I considered it, but was more interested at the time of just making the generator work correctly. While researching the correct wiring configuration of our generator, we discovered, based on a picture we saw (they nothing alike!),

that the device under the hood of my car was, in fact, an alternator. After another more in depth look at what we had, we realized that someone had attempted this conversion before. However, based on the wiring configuration used by whoever that was, we knew that person never got it working correctly.

Charles found an excellent picture of how the GM 3-wire alternator (yes, GM) was supposed to be connected. There is a plastic plug with two wires that connect to the two terminals on the alternator. These wires were reversed (reversed only if you care about proper color code, which I do). We switched the wires around in the plug. We connected the other wire to Field on the OEM voltage regulator attached to the car next to the radiator. Now, we measure ~14 volts across the battery, and the GEN light goes out like it should.