Just a hunch....if its blowing immediately, your horns are on the signal fuse....Yamaha typically wired these so the horns is hot and the horn button grounds to sound the horn. Unhook connectors and check if there is a short from either terminal to ground....one probe on a terminal, other on bike ground...retest on the other terminal. You should be open (infinity) to ground.
If fuse is fine till turn signals are used....inspect each socket for wiring damage.
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