Curt trailer wiring harness kit # C55326 fits other Ford/Mercury vehicles but we do have options for a 4-pole harness for your 2007 Mercury Grand Marquis.
Only hardwired-type harness kits are available for your Grand Marquis are shown on the linked page. I recommend the Curt Powered Tail Light Converter with 4-Pole Flat Trailer Connector # C59236. You will also need a circuit tester like # PTW2993 to help you find the correct vehicle wires for connecting the harness. view full answer...
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