Just because I'm tired of arguing this point, and I thought it would be very informative to those who have recently been experiencing problems. There are 3 pages to this, so don't forget to go to the 3rd one.

http://www.madelectrical.com/electricaltech/onewire-threewire.shtml

If you want to know more about other electrical/alternator stuff, go to the electrical tech section by clicking at the top of the page.

This article along with Schurkey's Diagram and a Diagram that Vann posted were what convinced me to just go to the CS style alt. Glad I did, no SPAL fans with out it