Difficult to say, but... The most likely scenario is abraded wiring somewhere in the loom - it is a relatively common issue, causing a short to earth. Start by taking the tank off and having a good visual inspection. Also check all the multiplugs for corrosion, particularly the ignition switch, along with handlebar controls and main fuse/starter relay.

After that you're going to have to get the multimeter out an methodically continuity test the wiring.

BTW - Welcome on board!

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