Horn trouble

[maxwell75c10]

I have a 1975 c10 350, and my horn dosen't work.
I put in a new relay, pluged the horn in, and checked all the fuses. any advice?  or could some one tell me where a wireing diagram is. thanks

t

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[75 C20]

Every once in awhile on my 75 c20 the horn doesnt work but its a lose conection right where the wires go into the horn. I ussally can just pop the hood and push the wires towards the horn and it's good to go for a while. If that doesnt work hook and electric meter or smth t o see where u lose power at- see if u do have power at the plug by the horn or if u lose it at the fuse box.

[Lt.Del]

You can run a jumper lead straight from the pos. terminal on battery to the horn and see if you hear anything....put your ear right up against the horn when you do this

SgtDel

[777884chevy]

I'll bet the horn is just shot. They may look pretty good on the outside but messed up inside. I have taken some off before that looked good but turned it upside down and rust came out