Make installing a trailer wiring harness on your Mercury as easy as possible with a custom fit wiring harness from Draw-Tite, Curt, Pollak, Tow Ready or Hopkins. A custom kit will eliminate or reduce the need to cut and splice wires in your Mercury while helping to protect sensitive electronics.

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Wiring Adapter Fitguide

Need help to find the correct wiring adapter for your car, truck, or trailer?
Use the Trailer Wiring Adapter Fitguide to easily find the adapter you need.

Trailer Connectors and Adapters

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Trailer Side Connector

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Mercury Mountaineer Custom Fit Vehicle Wiring Questions and Answers

Installing Fuse Holder on Battery in Trailer Wiring Harness 118345 for 2000 Mercury Mountaineer
The yellow fuse holder starts out as a closed loop. You will need to cut it in half. One end connects to the power wire you ran from the wiring harness. The other end will connect to the positive battery terminal. Inserting the fuse should be the last step. Take a look at the video I have linked at about the 3:40 mark that shows our installer putting in the fuse holder. I have included some additional links that will help with installation.
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Adapter to Connect 7-Way Vehicle End to 4-Pole round Trailer Connector on 2002 Mercury Mountaineer
There is not a plug and play adapter to go from a vehicle end 7-Way connector to a 4-Pole round connector. One can be made to work with your setup using the following parts. Pollak Black Plastic, 7-Pole, RV-Style Trailer Connector - Trailer End, item # PK12706 Bonded 4 Wire - per foot, item # 16-4B-1 Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Socket - Metal - Vehicle End, item # PK11404 If you do not wish to build an adapter for your setup you can change out the trailer connecto
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