Headlight problems 91 regal

3800 V6 3.8L Vin "L" 91 Regal GS. 74K. I replaced the dimmer switch(steering column), the headlight switch (on dash), and the lamps. My only guess is that it must be in the wiring somewhere, some sort of frayed wire or something. My highbeams work but my regular headlights do not. Any suggestions? Comments would be appreciated, thanks in advance:)