The headlight switch powers the relay that will power the bulbs your problem is either the switch or the relay locate headlight relay in fuse panne under hood use a testlight test if tyou have power at one terminal then turn on switch you should have power at another terminal if you have switch power replace relay if not check wires and connector at switch if ok replace switch
hope this helps plz vote and comment on answer if you have any more questions reply
If all other lights work, have you replace the low beam filament is burned out try swapping out the headlight bulbs.
SOURCE: Jeep Headlights not working. High beam works
had the same problem on my 92....check under the hood on the drivers side,towards the front,there is a "junction box" with all of the lighting wires connecting from the switches to the lights.My wires were all corroded inside,so I cleaned the ends and bought a new box from the local electronic supply store.The problem has not come back.
Cheers
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