How do I make a 1 wire GM 1988 serpetine belt alternator work on my 2 wire plug thats on my 1979 Camaro wiring. I'm changing over to a serpentine system on my car and the only thing left is the wiring for the alternator.

 

Take the alternator apart and swap out the self-exciting voltage regulator with a conventional one. Btw, the voltage regulator is what your 2 wire plug plugs into.
Or.....you can use the one wire alternator as it is and make your charging system one wire.

 

I like the second idea you posted, but how do I make my factory wiring a single wire charging system?

 

You simply run a wire from the output connection on the back of the alternator to the positive cable on the battery. The gauge of the wire depends on the amp output of the alternator. If it's a 55 amp, use a 10 ga. wire. If it's a 75 amp, then go with an 8 ga. wire. I'd try it out first before making it permanent, to make sure you like the way the charging system is working. The way your car is set up now, there is a voltage sensing wire (one of the wires on the plug) that connects to power way downstream from the alternator. That wire tells the voltage regulator how much charging the electrical system needs based on what power options are sucking juice. Since the one wire alternator is self exciting, it's not reading the downstream power usage like the 3 wire was. So if you are running a lot of power options, the one wire is likely to not work as well for you as the 3 wire. One wires are great for simple, more bare bones cars, but not necessarily the greatest for an optioned out car. Try the one wire since you already have it and see if it gives you any issues. I would not go out of my way to convert an existing good working 3 wire system to 1 wire though.