I have a 69 camaro ss.I replaces the old wiring harness with an american wire harness.Everything works except the headlights.I tried the 7 blade and the 8 blade switchs still no headlight.im getting power to the switch.i have 1ground under the dash close to the switch grounded and i have grounds by both headlights grounded whats wrong with my car im tryin to cruise.

i do have brake lights and 4 way flashers

check the dimmer switch behind your left foot. If the wires to it came undone or its not grounded, they wont work :)

Yes I would check the dimmer switch. It might have a bad contact. Push it from low beam to high beam and see if they will come on. You can also check to see if you have 12 vdc to it and to each low and high beam circuit. That way you will know if the switch is good.