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Go for a new battery...
Hooked the new battery up yesterday and bike fired right up.
Have pulled the fuse on the positive lead, realised it should probably be inside in a holder but instead has just been flapping about under the seat so may have been shorting against the frame or something.
Have some little insulated blade fuses and holder on the way and will run one down to behind a side panel so I can pull it when bike is not in use.
M_V
There is a diode pack somewhere on the bike, usually near the stator,might have gone bad allowing weird stuff to happen.
Yes on charging issue, it would go bad quite suddenly ime. Usually just a wire breaks or it shorts out against itself internally.
Go for a new battery, if it's more than 3 years old always worth getting a nicer one
Have a li on on the BMW. Been there about 3 years or so, even courier on it with hand warmers full tilt, lights on and a phone charfibg it never struggls