Check near and the connectors near the bulbs for loose connection and check that ur bulbs are insertd in the right position ring main dealer and ask would there be a secondary fuse box in your jeep and explain the problem
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There's a harness that runs from the rear body into the hatch, through a rubber tube. These wires break with age and movement.
Remove the hatch brake light and verify that the unit is getting +12v when the brake pedal is pressed. If so, connect +12v + Ground to the brake light directly, and see if it works. If not, you have a ground issue (usually corrosion) the brake light. Look for the ground connection in the hatch harness.
Repairing the hatch harness is doable, and easier than replacing the whole harness.
This is just a guess , so please don't give me a bad rating. to me it sounds like the switch on the brake pedal is broken ( stuck on ) so brake lights are on , but have burned up the rear bulbs. Highmount light might be LED so runs cooler and does not burn out. Try new bulbs in the tail lights.
I believe the brake light on the hatch works off a different fuse then the taillight brakes. Double check to see if there is more then one fuse for brake lights. By pulling the fuse you changed and leaving it out, see if the hatch light comes on or not; this may answer at least one question if it is one of the fuses. If your running lights in those bulbs are coming on; you probably have a good ground, if not it may be a loose ground wire.
Are you sure it is a bulb issue, if all the brake lights are not working chances are it may be a brake light switch which is located on the brake pedal assemly.
If it's the bulbs, there are two screws holding each rear light assembly in place, open the hatch, they are on the hatch side of the lights, remove the screws and then the light will come free, to reove the sockets just rotate them and they will come out. pull the bulbs out and reverse all the steps.
If you need a switch, let me know, I'll give you the steps for replacement.