Trailer Hitch Wiring Harness - 4/7 Pin - accessories Contains module and harnesses to splice/connect to the factory electrical system for 4-7 pin trailer wiring Provides customer with wiring for aftermarket trailer brake controllers Not available on some Long Wheel Base Gas Vehicles. Contact your local dealer to verify compatibility. Dealer installation recommended. . Compatible with Transit 2015, 2016, 2017, 2018 Ford Hitch Wiring | Harnesses, Adapters, Connectors Connect the wiring from any trailer to your Ford, quickly and easily. We have the plug-and-play harnesses for the job with no need for cutting and splicing.