First off, does it turn over (crank) and not start? If it does and the motor sounds like it should start and it doesn't then check and see if your car is equipped with an ignition module, which I'm pretty sure it does. If it has an ignition module, replace that and it should solve your problem. Ignition modules are inexpensive and easy to install.
yes it will i have a optima battery in my 1995 marquis
Might be you alternator. Happened on my 1997 grand marq a couple of weeks ago
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.
Either the battery is very weak or the alternator has bad diodes .
Battery may have a dead cell and need replacing.
Mercury Grand Marquis was created in 1983.
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