Is it just one or both? If it's just one, have you tried replacing it? If not, replace the headlight first. If that doesn't work, check the socket for heavy corrosion. IF there is corrosion then replace the socket. If it is both headlights and they are not simply blown out, first check the headlight fuse. After that check the headlight switch, those are the best places to start. Let me know how it goes.