Yeah I have seen a few of these. Go under the hood and where the back of the headlights are (cans) there is a single ground wire from the harness for the headlights. Remove the small bolt/screw and scrape a little paint where it sits on the metal and clean the terminal ends and reinstall.
For the rears take the lens out and you will see three mount bolts to the tu for the light assy. Remove and do the same thing back there. Re assemble and see what you get. While everything is apart make sure all the bulbs are good and the right numbers.
89 2.5 TBI, 4" RC lift, 1" Booms, SYE, Adams Driveshafts front and rear, Ford 8.8 with 4:88s, BFG 33X12.50X15, and a ton of other stuff.
AF Jeep Club Tail Number 184