Pollak Replacement 7-Pole, RV-Style Trailer Connector ...
The 2010 Ford Expedition should have a round connector at the rear of the vehicle where your 4 pin plug is plugged in. If there is a round connector there you can use the Replacement Multi-Tow 7-Way and 4 Pole Trailer Connector, item # 74682, to replace the 4-Way OEM connector on your Expedition.
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