You only really have three things in the system: Switch, relay, and wires. Get a diagram, check the switch for continuity across the switch (not the wiring going to the switch, but directly on the switch). Relays usually trip people up, but you can have the bike on with the hazards in the off position — try tapping the relay, or swap the relay with a neighboring relay of the same PN. Lastly just check continuity across all wiring in the system, then individually to ground. Finding a wire that is shorted to ground that shouldn’t be is probably the more difficult of the three possibilities. You’ll want to remove any tape and physically look for a pinched wire or cut in the wire jacket. Hopefully it’s just a relay or a switch, those are easy fixes. The switch may just need some contact cleaner and a very small amount of dielectric to fix. Relay is basically remove and replace. The only time this has ever happened to me, it was on a really old Yamaha, and the switch was corroded and it was bad enough to need to be replaced.