Dave, you are correct. As far as the headlights are concerned, the headlight switch just sends power to the dimmer switch, and the position of the dimmer switch determines whether the high beams or the low beams receive power. Since your low beams work, it's not your headlight switch. It's also not the wire between the headlight switch and the dimmer switch.

Check out the stuff I suggested and then get back to us.

1977 CJ-7, fiberglass body, AMC 360 w/ headers, DUI ignition, Edelbrock intake and Holley 4150 carb, TF999, Dana 300, 4.56 gears lockers, York air comp, 4" susp lift, 2" body lift, BFG 35" M-T tires, Megashifter, AGR pump & box, REP8000 winch.