I finally came across a manual that shows the 65 66 single headlight trucks. This is for the Right Hand Drive truck but I looked at the wiring diagram and compared it to my 66 wiring harness and it looks the same to me except being reversed sides of the truck.
My PhotoBucket it set to share and there is a link in my signature. The files are in the 520 folder. I have them in pdf also if you want the pdf PM me with your email addres and I will email them to you.