1966 valiant ignition problem

Yes, fuse link, but the radio would not work unless the radio is aftermarket and "wired around"

You can download a free factory shop manual here:
http://www.forabodiesonly.com/mopar/showthread.php?p=1970088617

and here

http://www.mymopar.com/index.php?pid=31

and MyMopar also has "simplified" wiring diagrams, but these are not always correct or complete with some options like AC

http://www.mymopar.com/index.php?pid=18

On the 66 manual, you will have to "play" with page numbers, because the original Mopar ones used a "dash" system, IE electrical chapter starts on page 8-1. The MyMopar ones are consecutively numbered

Also, read this article:

http://www.madelectrical.com/electricaltech/amp-gauges.shtml

Even if you never perform this bypass, this explains the how and why of the main power in these cars, and the pitfalls that affect nearly all of them.

By the way do your headlights work?