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try unplugging the horns to see if they are the problem. If the fuse still blows, the problem is the wires from the relay to the horns. If the fuse doesn't blow, plug in one horn at a time to see which one is bad.
The horn relay might have welded contacts (stuck in the on position). Pulling the relay should stop the horn.
The wiring harness on the steering column might have a broken wire to the horn relay shorting to someplace that applies power to the relay. In this case, turning the steering wheel all the way to one side or the other may stop the horn, and it won't sound when you press the horn button.
The horn button in the steering wheel is stuck on or shorted.
When you press on the horn button do you hear the horn relay click? The start at the horn, bench test it, if it works then check for power, is the fuse good and is the relay ok. If the stuff checks out then it may be the horn contacts behind the steering wheel.
Very possibly the horn relay. This is located in the left junction block ( fuse panel) on the left side of dash. Open driver door and you will see a panel cover on the end of dash. On the cover it should list the position of the relay which I believe is on the right of fuse panel. If you try the horn and it sticks on again, try tapping the relay, if stops then that is the problem.