There is an over current condition. You could have swore shorted to ground or a failing a c clutch.
A bad starter can cause a Mercury Grand Marquis to not start. A bad alternator or a problem with the security system can be the cause for the car not starting.
i have no heat in my 1994 mercury grand marquis. what could cause the heat to stop working
Blown fuse.
The shocks are there for a reason. Removing them would cause damage.
Perhaps your timing.
Dead cell in the battery. Something on which is drawing power from the battery. Stuck relay.
Intake manifold gaskets are leaking, intake manifold is warped.
Because whoever told you that a low battery would cause hard steering is an idiot.
Many things could cause this. Loss of air pressure, air pump not working, etc.
The fuse. A shorted horn can cause the fuse to break.
If a 1988 Mercury Grand Marquis shifting out of second gear gets choppy after acceleration then the overdrive band may need servicing. An overdrive band that is sticking can also cause this problem.
mass air flow sensor, O2 sensors, bad fuel pump