My saph has been stood for about 3 weeks without being run and when i came to start it the battery was flat. Jumped it off and went out for a decent run, kept having issues with the radio turning itself off. Once i got it home, parked on front, went out to it an hour or so later and it was flat. Although it turned over.

Charged the battery over night, started this afternoon and all was well, secs moniter was reading 13-13.3V at idle. Held charge all afternoon then i've taken it out tonight and the voltage is dropping, with lights on and radio on it shows around 12.5V but when fans kick in it's dropping to 11.5Vish.

Does that sound right to assume the alternater is on it's way out?