Amazon.com: 4 way to 7 way trailer adapter
Oyviny 4-Way Flat to 7-Way Round Blade and 4 Way Trailer Wiring Harness Adapter Vehicle-Side 4 Pin to Trailer-Side 7 Pin and 4 Pin Dual-Output Connector with Mounting Bracket for Truck RV (Black) 4.6 out of 5 stars. 46. $26.99.
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