Should a battery tender charge my BMW battery fully when pluged in though one of the two auxilary jack on the LH side of my 2002 rt? It is either not charging fully or the battery is compromissed. The battery charge seems to deplete quicker than I think it should. With the bike running I am getting 14 volts when checked at the battery. I need to buy the necessary epuipment to do a load check on the battery. Any other ideas?