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I haven't experienced a stuck open with the deuce horn solenoid. I had one that stuck closed. Tends to be a buildup of dirt or corrosion over the decades. I have seen solenoid valves in industrial machines with the problem you seem to have. The main thing I've experienced in all old trucks is...

Yes. 24v to one terminal of the horn. The horn button/steering column connects to the other horn terminal.

The steering column and the horn button are used to provide a path to ground. The 24V feed should go to one side of the horn. The line from the column and button goes to the other terminal on the horn. Sounds like you connected the column to 24v. That would be just a dead short when you push...

The breakers are 15amp. A 10 or 15 amp fuse should be fine.

The part number is M13512/1-1. I usually order electrical parts from Saturn Surplus or Erik's.

It would be a fire hazard to not have circuit protection. You don't have to use a breaker but an in-line fuse would be really good idea. Fuse should be as close to the source as possible. The fuse's purpose is to protect the wire in case of a short.

The left one is the horn breaker. The right one is the heater breaker.

The horn power is fed from a circuit breaker on the firewall, upper driver's side. There will be one or two breakers if you have a heater installed or not. Those connections tend to be fried from age. Also, the breaker could be bad. On my deuce, I had to replace the breaker and run a new...