Sounds like a headlight swithch to me. Stan The Light Control Module is going out. The headlights are the first to go. It is a black box right above the accelerator under the dash. Two screws and two plug ins and she will come out. Cost about $300.00 at Ford. $100. from a salvage yard, if you can find one. 1998 to 2003 are the same. Allen
The headlights could have bad bulbs or a bad fuse; the two sets of lights are on different circuits.
The dim lights on a 1994 Grand Prix could go out when the headlamp switch is on if there is a short in the wiring for the headlights. There could also be a problem with the bulbs themselves if they were touched during installation. The oils in the fingers can short out new headlights.
Did you check the lights? They could be dead!
sometimes the head lights and tail lights may be fused separately,check your fuses.you could have a bad ground.thats just two places to start.
They are either the wrong bulbs or one of the filaments is burned out. The bulbs should have two filaments. One is illuminated when the lights are on. The other is brighter when the brakes are used.
If your headlights work, but your tail lights don't, your bulbs could be blown. It is possible that you have a shortage in your car.
i was wondering whether the switch at the parking brake could affect this problem.
Nonfunctional Brake LightsOne possible cause of this issue is that the brake light switch is not adjusted properly, or the switch could be defective.
If parking and tailights are working could be headlight switch--rheostat for dimming control could be bad
It could be a short in the wiring, or a fuse or the headlights themselves might be bad. I hope this helps
If the headlights are on and brake lights work but not the tail lights, it is possible there is a short in the electrical wires. Another cause for this could be that the tail light bulbs are burned out. Most vehicles have more than one bulb inside the tail lights to control different lights at the same time.
it could be the headlight relay. if not it may be in the switch.