I went for a ride and my ski ran great for 3-4 hrs. Didn't have any issues starting throughout the ride until right at the end, went to start it and the battery was dragging like it was dead. Jump started it off my buddies ski and it ran until I killed it then wouldn't start again. Got it home and put a fresh battery in and measured the voltage. 12.5 volts not running and it was the same voltage when I started it. I'm assuming there's an issue in the charging system. Where should I start testing? Does this sound like a stator?