horn relay

Hard to say. Pull the horns and jumper power to them directly. If they won't sound, the contacts are likely dirty/ rusty. Try adjusting the horn while connected to power NOTE where you started from with the adjustment, and rotate the adjuster vigourously back and forth a few times to see if it will make contact and start to operate. Then reset it back to where it was, verify it works, and if necessary, readjust for proper "noise" LOL

On the other hand, if you can jumper power to the horn(s) and they work, then the relay is SNAFU. FUBAR. AFU. BO'd