It's one of two switches located on the Break Pedal. One controls the Brake Lights and the other controls the Speed Control. Hope this helps
speed control switch inside trans
on a 1997 Mercury Grand Marquis kill switch be activated by a rear end collision
The 1986 Mercury Marquis does not have a fuel cutoff switch. The fuel pump does have a fuse, of which could render it as nonworking.
It's near the brake pedal or brake light switch.... It deactivates cruise control
connected to the turn signal
Located in the brake pedal assembly
where you turn on the headlights ... push the button
Why ? Just replace it.
its in the trunk
It's located on the steering column 2 screws unplug the harnest
it is on the firewall and difficult but not impossible to get to and replace.
if it is the same as my 97 it is in the trunk on the drivers side.