I have a 1978 Chevrolet C10 that it's horn doesn't work. A friend of mine that used a tool to test the horn and the horn does indeed work but it turns out that the problem might be with the horn contact in the steering wheel and somewhere along the electrical circuit of the horn. I replaced the horn contact with a new one and the horn still doesn't work. When I tried to put back on the steering wheel the horn contact made some sparks but the horn did not beep. What could my problem be?

 

get ground wire...the horn contact just grounds the circuit...try sticking ground in the hole and see if she honks...if not,it could be the horn relay if your horn is good