Wire short

Ive got an electrical prob in my 73...well a cupple, the main one im worried about is when my dome light is on and i hit the horn it shorts out (i lost use of my horn in the steering wheel) what happened is when i was in a friends driveway i had the dome light on and hit the horn and a whole bunch of smoke came out of the steering wheel (not the colume) so i took the cap off and the spring inside got so hot it wouldnt go back out, it was like it was pinched, the other wireing prob i have is with the turn signal (i kinda like this one) when i have the left turn signal on the lights alternate, not in unison, like police flashers. thx for any help in advance