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The horn solenoids valves are renowned for sticking and the fuse should be in the Battery Control Center under the driver area in the outside compartment. You will have to remove panel to access all of the electrical relays and fuses. I would suggest someone start the engine and hold down the horn button while you tap on the horn solenoid valve (usually on the fire wall with air lines in and out).
Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7