Tom,
This idea is probably at the end of your list, or not even on your list, but building your own harness is EXTREMELY simple, and fun!
If you take your wiring diagram and actually count the number of wires involved, you might be surprised...pleasantly that is.
When you identify a start point for a wire, and a destination point for that same wire, it is just a matter of going from "here" to "there".
You will learn how the system works as you do it.
Stuart
