check the fuse for the brake lights, they have thier own. also check the brake light switch at the at the top of the brake petal
The running lights have a bad ground.
burnt out lightbulb!
Check the switch at the brake pedal .
Check fuse number 4 on the inside fuse panel, something made it blow though so expect it to go again until you find the reason.
there is an electrical switch called a brake sending unit attached to the brake pedal under the dash check that there is an electrical switch called a brake sending unit atatched to the brake pedal under the dash check that
I'm not a mechanic but I would start by checking the brake fluid level in the brake master cylinder in your engine compartment
Check the wire which is going inside of the trunk hood to the brake lights.
My '93 Sport does the same thing periodically. This may be a cool safety feature Jeep uses to indicate your brake lights are not working. If this is the case it is as simple as replacing fuse or bulbs. if your lights flicker on and off i wouldheck for a short in your electricle systm or if they went out and stayed out i would start by checking the fuses in your fuse box.hope this helps.
Blown bulbs, blown fuse, broken or out of adjustment brake light switch.
blown fuse blown fuse
check the brake light switch on the brake pedal
Sounds like the main ground wire for the rear lights broke or rotted off the frame.