A buddy of mine just gave me his 2003 wr450F that has not run for a few years. I purchased a new battery and when I tried to start it, I only heard the relay click. I then jumped it off my truck battery, and the started turned over and I was able to get the bike running. But I cannot take off the jumper cables or the bike will die. Also, none of the lights or horn work. I think I pieced together that they run on AC so will not work until the motor is running. But once the motor was running the light still did not come on. So I am a bit stumped as to what is going on. Do I have a ground problem?