I have a 2012 sportsman 850 battery went completely dead after I left the dang key on. Tried charging it all I get is a click from the starter when trying to start it after charging the battery all night,everything comes on like it is suppose to when turning the key on, headlights work taillights brake lights everything but i get nothing when turning the key, took the battery off just hooked jumper cables up trying to get it to start to make sure it was for sure the battery and not something else and still all I get is the click from the starter. took wires off of starter cleaned them to make sure i have a good connection and still the same thing. took off the starter solenoid fuse and it is working fine, I don't know what else to do. will the thing start without having the batter hooked up just off of jumper cables from the battery on my truck? I would assume that it would no problem. I'm stumped maybe something simple just need someone input. any help and responses are appreciated.