Mercury Grand Marquis
Radio

How do install a CD player and amp in a 1983 Mercury Grand Marquis and do you have to cut the radio opening bigger to fit CD player?

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Wiki User
09/12/2011

most modern aftermarket CD player/stereos should fit in the original spot no problem. but most mid 80's grand marquis used a floating ground setup, so in order to hook up a new stereo you will probably have to purchase a floating ground adapter to convert the several negative speaker wires to the one negative wire in the original wiring harness, they should run you anywhere between 15-35 bucks