I have an ´06 Scrambler which I ride every day. Last month my battery went completely dead. It would not hold a charge at all. I bought a new battery. Day one no problem (started right up). Day two, it sounded like my old battery (it took a few seconds to start). Day three, it´s dead again. Completely dead, like something drained it while it sat (I did not leave the lights on). Is the alternator responsible? Any help would be much appreciated.