It's located on the steering column 2 screws unplug the harnest
For a 1988 Mercury Marquis remove bottom shroud from steering column (5 Philips head screws). There is a wire running from the ignition switch to the left side of the steering column; detach it from the coupler (This can be done without a tool). Turn key to ON position until the panel lights come on. There is a small pin near the bottom of the key lock; push it in and pull the ignition switch out (don't panic if the wire seems to be stuck; it will come out). To replace, turn new ignition switch to same position. Push pin on the ignition switch in while sliding it back into the steering column. Reconnect wire and then replace shroud.
Why ? Just replace it.
To remove the ignition switch from a 1986 Mercury Grand Marquis, first, disconnect the negative battery cable to ensure safety. Then, remove the steering column cover by unscrewing the screws and carefully pulling it apart. Next, locate the ignition switch attached to the ignition lock cylinder; disconnect the wiring harness and remove the mounting screws. Finally, pull the ignition switch out to complete the removal process.
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The 1991 Mercury Sable ignition switch is held in place with a retaining ring. Loosen the retaining ring. Pull the ignition switch out. Remove the wiring harness from the rear of the ignition switch. Reverse the process to install the new ignition switch.
it is on the firewall and difficult but not impossible to get to and replace.
on a 1997 Mercury Grand Marquis kill switch be activated by a rear end collision
found this, might be the same, Merry Christmas, anyways! :) For a 1988 Mercury Marquis remove bottom shroud from steering column (5 Philips head screws). There is a wire running from the ignition switch to the left side of the steering column; detach it from the coupler (This can be done without a tool). Turn key to ON position until the panel lights come on. There is a small pin near the bottom of the key lock; push it in and pull the ignition switch out (don't panic if the wire seems to be stuck; it will come out). To replace, turn new ignition switch to same position. Push pin on the ignition switch in while sliding it back into the steering column. Reconnect wire and then replace shroud.
To install an ignition switch in a 1995 Mercury Grand Marquis, first disconnect the negative battery terminal to ensure safety. Remove the steering column covers by unscrewing the screws and gently prying them apart. Then, locate the old ignition switch, disconnect the wiring harness, and unbolt it from its position. Finally, install the new ignition switch by reversing the steps, ensuring all connections are secure before reassembling the steering column and reconnecting the battery.
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.
You do not need a key to replace the ignition switch.
how can you start a '89 mercury cougar with a broken ignition switch?