Hi peps how do I no if my alternater is on its way out ..... Bike drives great and starts but if I have been out with the lights on its flat wen I come back to it I have had a voltage reader on it and it says the batt is ok 13-14v and the voltage seams ok wen running but wen I turn the lights on it drops to 11-12v ... Could this mean it's on it's way out and carnt cope ,,,, it had never cut out on me so it's prob just enough to keep it going but if you stall it it's flat help please