Can't get horn to work on 68 Barracuda

[cudajim]

I've been trying to get the horn to work on the old 68 ragtop. The relay is inside near the fuse box and it seems to be working just fine. I even took it out and checked it on the bench. Anyway, when I ground the horn wire the relay kicks in, closes the switch and sometimes the horn blows (rarely) but sometimes the relay acts like a buzzer. I tried to jump V+ directly to the relay, no change. I tried to jump ground directly to the relay terminal, no change. I even swapped the relay with one from my 67 Barracuda, no change. Both of them work on the 67 car but I get no horn on the 68. If I jump the horn wire hot to the battery I get both horns just fine. What's going on here?

 

[4spdragtop]

I would think switch in steering wheel?

 

[Murray]

First, put 12v directly to the horn- it should work loudly. If not, your horns not working. A common problem on old horns is that they get rusted/gumed up inside. Often this can be fixed. Most horns have an adjustment star on one side of the diaghram. Find this "star" or hex screw. You may need small vise grips, but turn it 1/2 turn left and 1/2 turn right to restore the contacts inside. The factory uses this to adjust the maximum loudness, you can too later. The moving of this adjustment, even though you have brought it back to "center" is enough to restore the contacts inside. Try the horn again, it should work.

 

[cudajim]

First, put 12v directly to the horn- it should work loudly. If not, your horns not working. A common problem on old horns is that they get rusted/gumed up inside. Often this can be fixed. Most horns have an adjustment star on one side of the diaghram. Find this "star" or hex screw. You may need small vise grips, but turn it 1/2 turn left and 1/2 turn right to restore the contacts inside. The factory uses this to adjust the maximum loudness, you can too later. The moving of this adjustment, even though you have brought it back to "center" is enough to restore the contacts inside. Try the horn again, it should work.

I did that and they horns sounded just fine like they are supposed to.