I have a 2001 Polaris 120 for my son. last night I replaced the clutch and while testing it on the stand, the lights went out. I did notice that they did seem to get brighter for a second, but i went back to adjusting the brake band. When I was done i noticed that the lights were out. Probably is a voltage regulator, but any way to test them with an ohm meter to confirm? I am sure that the bulbs are also burnt. I bet they are expensive at the dealer.