GO to eBay > eBay Motors > place search : For "2004 Mercury Grand Marquis Lighting Control Module" , Bunch of listings show up , choose the Lighting Control Module picture that is in WHITE NEW BOX , full instruction ,Where is located ?, step by step removal instruction is all there. The company is ELECTRONICS REMANUFACTURING SERVICE.
You need to Replace The Lighting Control Module (LCM). This is not a cheap part, but a common one to fail.
Flasher functions are part of the lighting module, there is no separate flasher.
you will have to remove the dash bord
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Behind metal plate on lower dash right above where your right knee would be when sitting in drivers seat
check you hazards...they're probably not working either. Not likely a fuse at all, probably the lighting control module. You can replace it yourself for around $200, or have someone do it for twice that.
It's integrated into the LCM (Lighting Control Module), located under the dash just below and to the right of the steering wheel. They are pricey.
lighting control module
lighting control module
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