the frame of the auto is used for the ground wire, notice the battery connects to the frame. most of the time when all else is good the problem is in the ground. check to see if the light bracket has a ground wire that runs to the frame of the auto. keep in mind the dome is made of cloth and or plastic, so it does not make a good ground. MAYBE THE WIRING HAS A BREAK OR 'OPEN' IN THE CIRCUIT. TROUBLESHOOT WITH AN OHMMETER TO FIND CONTINUITY OR A BREAK IN THE WIRES...BB
You probably hit the parking light switch inadvertantly! The switch is on top of the steering wheel column and is a rocker switch. I think that pushing the switch away from you will turn the parking lights on and pushing it towards you will turn them off - it may be vice versa though! Parking lights are for use in some countries when you are parked on an unlit street so that other drivers can see your car.
I have the same problem with my 1998 wrangler, I have been told it is the Multi-function switch in the steering column, but I have not changed it yet, can't seem to find it at local auto parts store!
The headlight switch may be bad. Try replacing. Its the Headlight switch. The switch has a built in Circuit Breaker that self resets. It has become bad and will eventually give it up.
You probably have a faulty headlight switch. Replace it and that should fix it. Been there, done that.
They could be burned out.
Possible defective brake light switch. These have been intermittant for several years. There was a recent recall for certain model years for this item.
The headlight switch that has the dash light dimmer knob. The dimmer switch went bad and you can only fix it by getting another headlight switch on most cars. Some though have a separate dimmer switch.
possibly a bad headlight switch, or dimmer switch. Some later model buicks have a lighting module under the dash about in the middle. I think yours is too old to have that though.
There may be a cut in the wire(s). You will need a Digital Volt Meter to test the wire(s) at your brake light. There is a switch that is actuated when you apply pressure to the brake pedal. If the switch is malfunctioning your lights won't come on.
It is because the brake light switch under the brake pedal is faulty. usually replacing this will solve the problem. it is designed in such a way that when the brake pedal is depressed the switch completes a circuit and the lights come on. the fault occurs when the switch closes the circuit even though the pedal is not depressed. hope this helps.
Try pushing the hazard light switch on steering column repeatedly. I had a strange problem with my hazards once and this fixed it for now. I think my problem was the signals not working though....
The switch that turns the headlights on. PULL it back once for front fogs(if fitted) and twice for rear fogs. This will only work with the headlights on though(sidelights or dipped) OK