You might want to read what these guys have to say about the so called one-wire alternators.
http://www.madelectrical.com/electricaltech/onewire-threewire.shtml Wiring a alternator with only one wire does not make it a one-wire alternator. There is a difference.
It goes along with what SoTxBoTi and Hot Rod Dad mentioned. One-wire alternators are great for trailer queens that hide all their wiring, but the three wire is a better setup for a daily driver.
