Battery voltage alone doesn't always mean a lot but seldom do they read that high if a bad cell or internally shorted.
Emergency stop/kill switch ON?
Clutch switch?
Main fuse?
I would suspect perhaps the positive cable to the starter solenoid is corroded at a terminal or internally burned off or otherwise not passing enough current.
You could perhaps test the solenoid and starter by (making double sure bike is in neutral) jumping a sufficient cable to the solenoid terminal. That would rule out (or condemn) the battery and cable, perhaps solenoid or starter.
Emergency stop/kill switch ON?
Clutch switch?
Main fuse?
I would suspect perhaps the positive cable to the starter solenoid is corroded at a terminal or internally burned off or otherwise not passing enough current.
You could perhaps test the solenoid and starter by (making double sure bike is in neutral) jumping a sufficient cable to the solenoid terminal. That would rule out (or condemn) the battery and cable, perhaps solenoid or starter.