The headlights in my 95 Z28 just stopped coming on. All other lights come on and the bell rings inside when the switch is on and car is off. I'm pretty sure it's not the bulbs. The dimmer switch is working and so is everything else. Just no head lights, high or low beam. Have tail and turn signal lights.
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Have you checked the fuses and the connections to the headlights?

 

I've seen on here where two of the same bulbs burnt out but not all four... be worth checking to make sure, these dang headlight bulbs can have short lives.