My first guess would be a ground problem.
The headlights and tail lights are controlled by the same headlight switch, but the brake lights are on a totally different circuit.
You may have to get a shop manual to get the wiring diagrams needed to troubleshoot the circuits if the ground connections are ok.
The lights involve the body computer and other components.
SOURCE: 2001 jeep grand cherokee lights
The problem is with the connection from the light bulb holder to the socket that the bulb and holder go into. I believe on my 01 JGC it was the top light that was going out when i applied the brakes with the lights on. If you remove the light bulb holder in the tail light assembly and look at the area that the bulb and holder came from either the metal that makes contact with the holder for the bulb is depressed, or in my case it was cracked. You can use a small flat scewdriver to lift the metal in the tail light assembly, or as i did, i just put some tin foil on top of the metal, then reinstalled the bulb and holder ontop of the tin foil (this makes the elec. connection). seems like a rigged up solution, but made sense to me, and worked!
SOURCE: 2004 Jeep Grand Cherokee - problem with power windows/locks
This seems to be the affects of a bad dinamo charging your battery . If you take a appart the dinamo you should fine a part called in mechanic terms "the bones" they look like 2 black magnets with a wire coming out of them . They are not expencive and you should not change your dinamo untill you try this first a car dinamo is very expencive .
SOURCE: i have a 1999 jeep grand cherokee and the brake lights wont work
there's a possibility that it might be the socket that the bulb actually goes into. my break light did something similar to that. the socket only cost about 8 bucks from the dealer.
SOURCE: 1999 jeep grand cherokee - brake lights and turn
The tail lights and the brake/turn lights use the same bulb but, there is 2 filamants in the bulb. One for tail lights and one for brake/turn lights. So just because the brake lights and turn signals work doesn't mean the bulbs are good. If bulbs are good you can check to see if there is power getting to the tail light assy's by unplugging the connector at the assy and using a test light probe the connector (harness side) with the headlights on. If you are getting power to the assy the test light will light. To make sure, turn off the headlights and test light will go off. Hope this is helpful. Good luck.
SOURCE: 2003 Jeep Grand Cherokee, how to replace rear tail light
I thinking tha you are fix the CHMSL (Central High Mounted Stop Light); review the Service Manual, the section ZJ-Secc-8L-Lamps (page 7, fig. 11).
I hope help you with this, good luck (remember rated this help).
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