I have a '99 Jeep Grand Cherokee. The dash lights go off and on and the break lights are not working. The tail lights, turn signal lights, back up lights all work. The clock even stays lit, but the other dashboard lights don't work all the time. I checked the fuses in the box I found under the glove box on the passenger side of the car. What else should I do?

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.

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I have not heard of this before and I am unfamiliar with your vehicle. In most vehicles, if your dash lights are not working your tail lights are also not working (they are on the same fuse). This means whenever your dash lights out, your tail lights are also out, which could put you in the position of getting rear ended by another vehicle or getting a ticket if a police officer see's your tail lights are out at night. It sounds like you are dealing with a loose or broken ground wire. I would start by checking all the tail light wire connections and ground wires located in the back of the vehicle. I have seen ground wires held together by a screw attached to a plastic tail light housing. When the tail light housing breaks it causes an intermittent connection (dim lights, out lights, etc.). A careful inspection of the wires, connectors, and ground wires may turn up the cause of the problem. A simple dab of molten solder, a piece of electrical tape, or a longer screw may be all you need to fix the problem.

Replace the turn signal switch. They started running all the lights threw it. They call it the multifunction switch now.

if no signals left or right replaceflasher unit under dash left side.

Tail light and backuo light are separate circuits. Backup light is under the control of the backup switch located on the shift lever or transmission. Thats why one might work right and not other. Most troubles of this type are due to poor ground connections Check again what you did to change the tail light assembly

You can purchase new tail light lenses and they will come with new sockets, plugs, etc.

Check for harness wiring in rear door.

check if the hazard lights work to see if it blinks if so you may need to trace down the wires to see if there is a break in it some were and yes the signal switch can do it too i hope this will help you ..

These Jeeps are notorious for the retainers breaking that hold the circuit board type wiring against the bulb contacts. With my 2000 Grand Cherokee, the brake lights would work when the headlight/tail lights were off. If the lights were on, the rear lights would go out altogether when I pressed the brakes. The easist fix would be replacing the tail light assemblies, but these are not cheap. My fix was to open up the inside cover of the tail light housing and use machine screws in each of the locations that the plastic tabs hold the retainer against the light housing.