Have No Power help!

Yeah its my 66 cuda. thanks for the help on the alternator/regulator problem i had 67Dart. Now i have this freaking problem to deal with. What about the feed to the fuse box is that in the main wiring harness? Cause my radio does not work either. I know it is getting power from the fuse block through one of the accessory light fuses. I was on even when the key was not in the ignition so when it stopped working i knew had a problem.