Brand new to the site. But I seen this on another site and hadn't found it here yet. I thought it could be helpful. It was for me while I am trying to un-screwup my new 1970 truck.
Here is the link to the 67-72 V8 and cab wiring.
http://www.flickr.com/photos/boundstaffpress/339741
67-72 chassis and cab wiring.
http://www.flickr.com/photos/boundstaffpres s/33966