Yes, the T-One Vehicle Wiring Harness, # 118551, does include the wire, and instructions, see link, for correctly wiring the your 2006 Mercury Mariner. The only gray area in the instructions is running the power wire forward to the vehicle battery.
Be sure to route the wire being careful to avoid any hot pipes, heat shields, the fuel tank or any other points that may pinch or break the wire. We have an installation video for you to review that should be helpful, see link. view full answer...
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