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just because the tail lights work doesn't necessarily mean the bulbs are good, many brake/tail lights have multiple filaments in them, you can usually remove a bulb and tell with your naked eye if a filament has failed. Another possibility is a fuse. Are you getting power in and out of that brake light switch?
actually it may still be the bulbs since they use dual filament remove the bulb and look at the filaments see if any of them look bad them tap the bulb with your finger nail see it any of the filaments vibrate if they do replace the bulb
on chrysler products the third brake light is run independant of the body control module, try checking the fuses that run the brake lights and see if any are faulty if not check you have voltage at the switch and a signal getting to the lights.
The contacts for the third brake light are two silver discs, about the size of a dime. They are located on the inside of the tailgate, hinge side. Make sure your carpet or any other loose item has not covered one or both contacts. Make sure they are fairly clean and make good contact.
I have a 2004 Jeep Grand Cherokee that I purchased only three months ago. It has already been in the shop three times in a month so I fee like I can help you with your problem. My rear brake light did the same thing and I just had to purchase the whole light socket. It only cost $13.00 from Jeep. I know your jeep is a 99' but the mechanic said that all Grand Cherokees from the last six years or so had the same problem. Changing the light bulb won't work. It will simply burn your bulb out. Simply buy the plastic socket that the bulb snaps in and that should fix your problem. It did for me.