headlights are not working . ground issue ? 1973 dart slant 6

67Dart273 said

If you have power to one terminal of the dimmer and no others, and operating the switch does not change things, then the dimmer switch is bad. If you have power at two terminals and no lights, the trouble is out in the engine bay

67Dart273 said

ENGINE BAY: After headlight power leaves the dimmer switch, high and low beam power goes out on separate wires through the bulkhead connector, around the fender to the headlights. Often, the headlights are BOTH grounded through ONLY ONE screw. Start by running along that harness and checking for ground screw(s) and making sure they are so

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Thank You . There is power to all three terminals at the dimmer switch . There is power at the inside and outside of the bulkhead on the high and low beam wires . It is close to full battery voltage 11 - 12+ volts . There is power at all three headlight terminals . Both sides . With and without headlights attached . Again , 11 - 12+ volts for each terminal ( all 6 ) . I tried a known good headlight and it didn't work .

I checked the ground screw you mentioned , but i am not sure i am doing that right . I tried the multimeter with one probe to the positive battery post and the other probe on the ground screw connection near the radiator . It shows 12+ volts . I didn't see any other grounds along the fender . Not sure what to do next .