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disconnect the horn or horns, operate the horn and see if the fuse still blows. if the fuse still blows then there is most likely a short in the wiring. relays rarely cause shorts. if the fuse doesnt blow with the horn disconnected, reconnect the horn and operate the horn again, if the fuse blows you have a shorted horn.
I would trace the wire from the horn and see if it was inadvertently damaged when the alternator was installed. If you have a voltmeter, you can remove the horn fuse and check to see if there is continuity between the horn (non hot side) of the fuse and the car body. This would indicate a short in the wire running from the fuse box to the horn. You can also look around the alternator mounting area to see if any wires are being pinched. Hope this helps. Good luck!
Most common problem is the ground that the horn connects to wit the bolt is rusted and causes it to pull to much amperage so clean the contact first then if it still blows the fuse then the horn relay or the horn may be going bad.over time the horn gets junk in it and causes the coil to overheat and causes it to burn out. Horns cost $15.00 for a new horn and are easy to change. I doubt the relay is bad but it is always possible.
You may have some short circuits in your wiring, a bad horn relay or horn unit, and/or a bad wiper motor. Hard to tell without actually looking at it.
Disconnect the horn, and try another fuse. Does it blow? If not, the horn is shorted, and needs replaced. If it blows, remove the horn relay & try another fuse. Same with the wiper motor, unplug it and try another fuse. If it does not blow, you need a wiper motor.