Theft system unless you get the computer reprogram you need to take out all the alarm system from old culuum key baril with resistor
Is the newer steering column from the same year MGM? If not, the wires may be in a different configuration.
There is a difference in the LS and GS, as well as different years.
SOURCE: 2008 Mercury Grand Marquis steering column diagram
Sorry we do not have this diagram. You need a factory service manual for this kind of detailed info. The manuals are copy protected but you can buy access here.
SOURCE: 1984 mercury grand marquis 5.0 has spark and fuel won't start
Have you checked the air filter?
Is it cranking?
Check the battery voltage. It should be around 12.5 volts or higher.
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