recently went out to get my 400 sportsman ready for a hunting trip and it would not start (would not turn over) thought I had a dead battery. went to jump start it and noticed the battery had corroded and the acid melted the solenoid ( quite a mess) went out and purchased a new battery and solenoid and cleaned up the connections, hooked everything back up. went to start it and the gauge turns on and panel illuminates but it will not engage the start by turning the key. If I by pass the solenoid it turns over. took it on the trip and started it by pull starting. Now have time to try and fix. Any idea on what could be causing the problem?