change the brake lights
check the fuse
check the brake light swtch
check your brake lights if they not worhing replace fuse or brake light switch
I have a 1996 Grand Marquis. If one of the brake lights goes out the signal on that side flashes faster. I would check the brake/tail lamps.
DOT 3
According to the 1996 Mercury Grand Marquis Owner Guide : ( DOT 3 brake fluid , meeting Ford specification ESA-M6C25-A )
Your Brake Lights. It's mounted on the Steering Column and is very easy to change. Around $10 at your local parts store.
Why ? Just replace it.
According to the 2001 Mercury Grand Marquis owners manual the fuse panel is below and to the left of the steering wheel , by the brake pedal , and has a cover on it
Check the brake light switch ,on the brake pedal. Might need adjusting.
THE BRAKE LIGHT SWITCH IS NOT PUTTING OUT BATTERY WHENEVER THE BRAKE PEDAL IS PUSHED DOWN. CHECK TO SEE IF BRAKE LIGHTS COME ON WHEN BRAKE PEDAL IS PUSHED DOWN. IF BRAKE LIGHTS COME ON, THEN YOU SHOULD BE ABLE TO SHIFT IT OUT OF PARK. IF NO BRAKE LIGHTS, THEN IT WON'T SHIFT OUT OF PARK. IF THIS IS THE CASE, THEN REPLACE BRAKE LIGHT SWITCH.
( # 16 ) is a 20 amp fuse for the cigarette lighter and OBD II in a 2007 Mercury Grand Marquis ( in the fuse panel below and to the left of the steering wheel by the brake pedal )
to the left of the brake pedal, mounted to the firewall.
driver's side , inside the car, near the parking brake.