The indicator lamp sources the left lamp for a ground when the right is flashing so I'd start there and work my way back. I'd bet on corrosion somewhere in that path or a chafed wire between the left handlebar control and the headlamp bucket...
A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort. Herm Albright (1876 - 1944)
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