Electrical failure please help..

[67chevy_hotrod]

OK so this is not a 67-72 chev or GMC... but it is a chev. I just need help with this because i am at a loss and you guys know a lot more about everything than i do. So my dad and i where working on the 1964 Bel-Air wagon, my dad was replacing the dome lamp and upon removal it arced and started smoking. Which is no big deal, we disconnected the battery and proceeded to find the whole deal was melted and black. So i just cut away the old bad stuff and wrapped the wires up with the intention of replacing the whole thing with a new plug later. Then I hooked up the battery and went to fire up the car and nothin.. no radio(which was on when it arced but then shut off when it arced) no lights except brake lights when the brakes where applied. And the horn works. But nothing else at all. Please help any knowledgeable input is greatly appreciated. Electric is witchcraft to me and my dad. Once this issue is resolved I will delete this post immediately. Did I mention that the wag is blocking in all the other cars and dinner is in an hour?