Horn wiring?

The horn itself lives underneath the battery tray and might still be there, probably got stuck on and someone unplugged it and pulled the wire up. The relay lives behind the glove box,
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Unplug the relay and check the black wire for connection to ground, if it only grounds with the horn pressed ( normal ) then you most likely have a stuck relay. If its ground all the time then you most likely have a short in the horn switch or column, and lastly the green and red wire could be shorted to a 12v source in the harness.