1999 Jeep Grand Cher LTD. No brake lights when brake is applied. Brake lights come on when lights are turned on (should be tail lights)Help!

There is definitely a short in the park lights system. Did you just have a radio installed....since the illumination wire sometimes gets grounded and will cause that fuse to blow until you fix that wire.

are we talking about the rear tail brake lights or the light on the dash. if dash light possible emergency brake slightly applied or low brake pressure in brake system or low brake fluid in reservoir. Rear brake lights ? check the brake switch under dash as it may have come mis adjusted for proper on/off activation

will u have a few more switches and relays to check/change brake light switch and relay/and headlight switch

next step is to run continuaty check on the wiring, boring and tedious i know

ther is a micro-switch on the park brake linkage and it is either defective or out of adjustment.

This type of problem can be caused by bad ground connections. Find as many as you can and clean the surfaces between the loop the screw goes through and the chassis (body). Take the tail light assemblies out and find the ground wires - black wires screwed to the body. Look under the hood, Pull the headlight assemblies out if necessary and find those little guys. They are generally close to the light. Follow the wire loom back from the lights and look for the black wires coming out. Loosen the screws and work the loop back and forth against the metal. Sometimes there is paint on the metal and the screw is the only thing making the connection. Work the screw in and out snug it against the loop and rotate the loop to freshen the connection.

I have taken my car to many shops to solve this problem. Long story short your tail light has a bad circut and entire lamp must be replaced. (Lamp cost approximate $130.00)

have you tried replacing the bulbs?

replace the soket that holds the bulb. it cost $8 at the dealer.