Brake lights stay on

E-brake may be fine, rear brakes may be near critical thickness

First, if you have a trailer wiring harness, check if it's chewed up and the wires are shorted. One common symptom is the radio display dimming. It has a circuit tied to the tail lights to tell the display to dim when the running lights are on. If you have a U-Haul-installed trailer harness with three red leds in the plug, it used to be common for them to short causing the same symptoms.

If that doesn't look like the problem, there could be a dealer / factory-installed adapter harness that you may be able to remove as a test.

Another common cause used to be using the wrong marker / tail light bulb. Single terminal on the bottom instead of the twin terminal that was needed. Newer vehicles use a flat, plastic-base bulb that this won't happen to. I think that's what you have. This problem applied to the older round, brass-base bulbs.

If none of these solve the problem, search for "beef99". He is a Jeep specialist and may have additional thoughts.

Caradiodoc

Next, unplug the tail lamp housings from the vehicle's wiring harness. If the radio display still dims when the brake pedal is pressed, the problem has to be in the vehicle. In particular, look for a buildup of corrosion between two adjacent pins in a connector, especially along the frame or inside the body.

If the problem is gone, plug one housing back in, then see what happens when you press the brake pedal. If the problem comes back when plugging in one of them, that's the one to look at for the problem.

By the way, I found a similar problem on a friend's son's Chevy truck not too long ago. One of the buttons of solder, (the contact) on the base of the bulb, broke off and was stuck between the right front turn signal terminal and the running light terminal right next to it in the socket. We didn't see it rght away because of the grease in the socket. His left signal worked fine but the right signal blinked real fast and caused all the running / tail lights to turn on, and the radio display flickered.

I put in a call to the administrators to contact beef99 on your behalf. I don't know how to reach him either through the forum unless he's online. Hopefully he will have some more ideas.

Caradiodoc

Under your dash you have a brake light switch that has a little button on it. If u follow the arm that has your brake pedal up under your dash you will see a (usually) black switch with a connector on it with a little button that touches the brake pedal arm. There has to be a little rubber bumper in the arm of the pedal to push the button on the brake light switch. If u can crawl up under your dash this is not to hard of a task. You may need to go to the dealer for the part as only select parts stores will have it.

If not the switch, the ABS may have something to do with it

See the guide below on testing wiring

https://www.2carpros.com/articles/how-to-check-wiring

The wiring diagrams for the rear brake lights and the ABS are attached below

Yest it can be. If u take the switch down and move the button in or out and nothing changes it is most likley going to just be a bad switch. When u unplug it they should go out.

Remove wires fron fuel pump and with volt ohm meter check to see if you get power and move wires and see if there is any change