I have a 2007 yamaha rhino 660. I recently rode a good long day and when I got home it would not start. Nothing, no dash display, lights or anything. I assume the battery so hook it up with jumper cables and still nothing. The ignition switch was acting funny so I replaced it and still nothing. From what I've read I think it could be the spark plug cap, but before I buy and replace would that effect it having no display or lights? Any suggestions appreciated.