The fact you said you rode it a little before the fuse blew makes me thing arcing at bad or loose connection, damage wire. May look for a spot where rubber insulation around wire is cut and may be arcing off metal somewhere. The diagram show battery + goes through main fuse to regulator and then ignition switch. I think I would start out checking wires and connection from battery to ignition and regulator.
Owners manual wiring diagram page395, 396
https://www.manualslib.com/manual/823557/Yamaha-V-Star-1100.html?page=396#manual
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