If you have any extra fuses, try replacing the ones for the head lights and tail lights. Make sure the fuses you replace are the same color as the ones you replace them with, that way the voltages are the same. Another issue is that a flasher could be going out.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/erik_3934b541f17c4e99
SOURCE: I have a 1999 Jeep Grand Cherokee Laredo - One Brake Light
First, I want to say thank you for the info, you saved me money and aggravation. Second it took mea little while to figure out what contact I was looking for. So I would like to provide a little more detail to make it easier for others in the future.
This is the corrective method for your brake lights not working when your headlights are on(2000 Jeep Cherokee Larado).
1) The cause of the problem is heat from the bulb.
2) Remove the light assembly as if you were going to change a bulb.
3) Turn the socket and remove it from the taillight assembly and set it aside(check to be sure your bulb is not burnt out).
4) Look at the opening, you will see 3 flat chrome colored contacts on the assembly.
5) Notice the one by it self at the top of the opening, that is the "ground".
6) If you look closely you will notice the plastic around the ground contact has shrunk a little bit, this caused the contact to pull away from the socket, causing the problem.
7) With a small flat head screwdriver, VERY GENTLY pry up the contact so it stays slightly upward by itself.
8) Re-insert the bulb assembly back into the housing and press your brake petal with your lights on.
9) You should be in good to go!
10) Tools: Phillips head screwdriver and a small flat head screwdriver.
11) Time : 5 minutes per light
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: the tail lights are out, so the brake lights-Jeep Grand Cherokee
i have a 2002 jeep grand cherokee i had the same problem when i would apply my brakes when the headlights were on my brake lights would go out, i found that my bulbsocket was not making good contact with the socket housing, if you notice when you take off a bulb, look at the light fixture where you unscrewed your breaklight bulb you will notice 3 medal contacts-they should be silver in the socket housing and like a copper on the socket bulb, in the socket housing their should be 2 silver contacts together and 1 by itself the one that looks by itself is making bad contact with the copper one thats by itself on the bulb, what you can do for a quick fix is; get a small piece of low cage wire or a thin piece of metal like copper stick that in to the bottom or top of that metal contact--i did it through the bottom leave the wire or piece of medal sticking out enough for where it can get contact with the bulb (just a little wire is enough to make contact, now screw the bulb on and test it---it will work----i did it to mine, if you need more assistance let me know [email protected]
SOURCE: !998 jeep Cherokee-no reverse lights...left turn signal
Replace turn signal switch on colum probubly emergrncy and turn combo check your back up switch on man transmission. if auto transmission check selector switch on linkage.
SOURCE: 94 Jeep Grand Cherokee Laredo: No power to left tail light
Traced the problem to the Lamp Outage Module located in the rear left quarter access panel behind the spare tire. Arcing had occurred on the left taillight line. Fortunately this part is readily available at your local Jeep recovery yard (none available in the U.S. from dealers). Recommend J& W Auto Wreckers in Antelope, CA (web site available). Massive number of Jeeps and fair prices. If you don't want to replace the LOM then you can join the two connectors that go into the LOM (LOM is optional) but you'll always show a lamp failure on your console.
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