Probably a dead battery in your device if its never been changed. There's usually a notch where you can pry it open to change it. Just make sure you compare and buy the right one.
thats my question to you
Mercury Grand Marquis was created in 1983.
You will find a sticker in the trunck with the factory code printed on it.
Mine was under the trunk lid. When you open the trunk you can see it up underneath towards the back. A white sticker with 5 black numbers on it. '94 Grand Marquis
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.054 is the gap for the Mercury Grand Marquis.
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Ou812
No , the last model year for the Mercury Grand Marquis was the 2011 model
yes
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Just a long shot, but check inside the trunk for a sticker.