My 2013 250 does this, It started just blowing the bulb now it actually explodes the bulb, shatters the glass like I hit it with a hammer!!!! No idea why, ive tried two new stock regulators and a trail tech adjustable regulator, that doesn't fix the problem. I have been through the wiring loom, stator etc etc. Drives me mad. I would really love to know how to fix this. Ive spent hours trying to get to the bottom of this and im stuck, had others look at it too, no idea whats wrong.
http://www.gasgasrider.org/forum/showthread.php?t=16717