Purney,
I think you might be looking at a different application. If you look closely, you will see two examples of the wiring. The one with the 'starter switch' is for a different style truck. The diagram you want is the one showing the positive coming from the ignition switch.
Don't confuse yourself. If you have a voltage tester, just find out if the + side of the coil turns ON and OFF with the key switch. It most likely will, and how it does this will be addressed later, after you get it running.
Stuart
