Wiring Color Codes
This covers most of the basic wire colors used on Airheads. As the electronics got more complex, more combinations came into play so it's possible a few of the more obscure ones may see other uses. Always double check factory wiring diagrams, and yes, even they can have a mistake or two. PowerBoxer.de has a copy of the Haynes ones. And here's a link for more about Airhead relays and terminal designations.
!!! NOTE !!!
It was common practice to substitute a different wire color if the proper one was out of stock, and then "flag" it with the proper color(s). As the flags' adhesive ages, it dries up and the flags often slide down the wire out of sight or fall off. If you have an 'odd' wire, identify it through process of elimination by