First check the fuses. If all fuses are OK, electrical troubleshooting is called for.,,,, see second answer!
I have had same problem, I have 2 1991 regals, it will be in your headlight switch, there are two different switches availble at the dealership, make sure you get the right one, it's a very simple change!
It was the dimmer switch..
Check the dimmer switch
Trun signal lights do not come on at all not on dash or outside
the dash and radio lights are supposed to dim when the headlights come on. Make sure you have the brightness of the dash lights turned up as much as possible.
CHECK BOTH THE INTERIOR FUSE AND THE COURTSY FUSE
use brutal force n a hammer!
I have a 1991 Chevy surburan and it has no tail lights and no dash lights, all fuses are good
there is no light bulb for the odometer. its a digital display. you have to replace the dash. used usally a 100. or so. had it happen to me. 2000 buick regal gs
The fuse box on a 1986 Buick Regal is located below the dash near the brake pedal. It prevents circuits in the vehicle from being overloaded.
there is a screw on either side of the dash where the doors open remove them and gently pull the dash out
Fuses?
a 1991 buick skylark has 4" speakers in the dash and 6x9's in back