72 chevelle electrical problem

[72drop]

Whats up all, im going to try to make this brief. I have a 72 chevelle with a 454. My altenator Shorted against a steel gas line. The hot wire from the back of the altenator the goes to the horn relay was getting super hot. To hot to touch. So i figured that somthing had to be grounded. So i test all the circuits that go to the horn relay. Come to find out that, That the red power wire that powers up the fuse block is grounded. So i pulled the engine harness to make sure it wasnt just a bad connection. It wasnt. the terminal is grounded .Not sure where to go from here And i also noticed that i lost my two inner brake lights are not working. And both bulbs were burnt. I still have blinkers and outer brake lights. Should i pull the fuse panel off ? What can i test? Any advice would be appreciated.