The brake light switch is under the dash hooked to the brake pedal at about midway up. It is a little switch that is like a push button that goes "CLICK" when activated, sending a pulse to the lights telling them when to turn on and off.
Why ? Just replace it.
on a 1997 Mercury Grand Marquis kill switch be activated by a rear end collision
check your brake lights if they not worhing replace fuse or brake light switch
DOT 3
According to the 1996 Mercury Grand Marquis Owner Guide : ( DOT 3 brake fluid , meeting Ford specification ESA-M6C25-A )
Find the switch attached to the brake pedal for the shift interlock and jump the two wires together. Be careful not to disconnect the brake light switch
Your Brake Lights. It's mounted on the Steering Column and is very easy to change. Around $10 at your local parts store.
connected to the turn signal
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
Mercury Grand Marquis was created in 1983.
Check the brake light switch ,on the brake pedal. Might need adjusting.
Fuse, loose connection, or the light switch. how do you remove the dashboard on a 94 mercury grand marque?