agree with all of the above, same (very) common problem in the honda vlx. they run their headlight through the cutout switch for the start button and the contacts can get corroded or glazed over. most times just cleaning the contact points with sand paper and grease will fix the problem. if it burns out, you'll have to replace it. it's around a 50/50 chance it'll be either. very easy to do. just crack it open and take a peek.