Check your fuses.
May possibly be in the multifuction switch on the left of the steering column!!!!
94 mercury grand marque dashboard, hazard, and tail lights do not work?
Check the fuses? Check the light switch?
The GMC dash tail and parking lights are on a different fuse from the brake lights. Check the fuses for a possible blown fuse.
check the fuses for the head lights check the fuses for the head lights
Did you check your fuses???
what does that question mean?? did you check fuses ? head lamps only or all lights ?? be specific
98 sierra1500 4x4 all lights work excepttail lights fuses are good bulbs are new
Check your fuses. See owner's manual fo rlocation and identification of fuses.
check fuses. check bulbs. check wires. If not any of those, good luck.
Brake lights should NOT be effected by the headlights. Brake light function is completely independent of the headlights. Assuming you are not refering to the tail lights, or marker lights, which are supposed to come when the head lights are turned on. Not having brake lights when the head lights are on is a big safety problem and should be corrected.