71 duster headlight issue

All lights on my car work but my headlights keep coming on and off then stay off. The car has brant new battery , alt , new battery ground to block cable and battery to body cable . The head light ground land on front radiator frame . I tried removing and class I did and putting back and also landing direct to battery . Nothing is working .

my high beam red light in my dash goes out too . But again all lights in the car function prefect . I have original sealed beams i it , also sealed h4 halogen style and slaps tried led . All do the same thing. Any time I check plugs with a meter I have voltage. 11 ish volts at idle and-14 at higher rpm . Any ideas ?