I was on my way home when I notice the lights for the speedometer were flickering off & on & the speedometer went from 30 miles an hour down to zero. The headlights flickered off & on and then the head pipe started heating up and smoking. I turned the quad off so it wouldn't catch fire, but then it wouldn't start back up and the lights wouldn't work. The battery still had juice because the winch still worked. Any thoughts on what could be causing this.