The horn fuse also feeds power directly to the adjacent BAT power taps on the fusebox and through the orange 240 circuit, to the dome lamp, cigar lighter, and factory clock option. Are wires plugged into the BAT power taps below the horn fuse? Unplug any wires connected to the BAT fusebox taps then unplug the horn relay, remove the orange wire from the back of the cigar lighter, and unplug the cluster-mounted factory clock (if it has one). Install a new fuse to see if it continues to pop. If the fuse doesn't blow, reconnect the wires to the BAT power taps, horn relay, cigar lighter, and clock, one at a time, to determine which circuit is compromised. Report what happens.
Mike, the black horn wire that runs through the steering column is a switched ground for the relay. If it chafed to ground the horn would sound continuously. It wouldn't blow the fuse.
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