Question edited for clarity, FULL 'year make model'.
Question moved to model category.
There isn't a fuse. If there was, someone could break the window, open the door and quickly remove the fuse. The anti-theft security system is a complex system involving the antitheft module, sensors, the ECM and the BCM. They are computers that can't be reprogrammed to remove anti-theft feature.
'Thinking' is not good. What brings you to this conclusion? There are ways to check for parasitic draw and thinking is not one of them :>D
You need a good auto-electrician with a pro grade scan tool computer.
Fuse Box Diagram Mercury Grand Marquis (2003-2011)
https://fuse-box.info > mercury > mercury-grand-marq...
Fuse box diagram (location and assignment of electrical fuses and relays) for Mercury Grand Marquis (2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011).
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