Just picked up a 2000 K1200lt, trailered it back from New York, started fine there. Battery was near dead when I got home and would not start. I hookked a trickle charger to the battery and it went full amps for a short time they shut off and cycled on and off. Turn the key on the bike no power at all. When I hook the charger to the battery I can hear a humming under the bike in the reverse switch if I were to guess. I charged the battery up out of the bike and hooked it back up it arced when I hooked positive up. Any suggestions?