Have a 2004 sportsman 500 HO , was working fine, decided to attach a trickle charger(the correct way) onto a newer battery, after a couple of weeks went to start it and no power to speedometer nor would start, but could turn lights on from switches. I put battery charger on and said fully charged. Disconnected positive led from battery and reconnected them, seemed to correct problem, ran the machine for a while then shut it off, and same problem started again,(did not disconnect battery again, but charger said full and lights would work)Any thoughts on where I should go from here?