T-One Vehicle Wiring Harness with 7-Way Trailer Connector 2019 Ford Ranger - T-One Vehicle Wiring Harness with 7-Way Trailer Connector. Quickly and easily install a 7-way, RV-style trailer connector on your Ford Ranger with this custom wiring harness. T-One connector plugs into existing tow connector - no cutting, splicing, or tapping required. ford trailer plug harness | eBay Find great deals on eBay for ford trailer plug harness. Shop with confidence. Skip to main content. eBay Logo: 02 thru 04 F-250 F-350 Super Duty Ford 4 & 7 Pin Trailer Tow Wiring Harness Plug (Fits: Ford) Brand New OEM Genuine Ford Parts from a Ford Dealership. Ford Trailer Wire Harness Hitch Plug Towing 13a576 See more like this.