Trailer Wiring Harness Installation - 2015 Ford Explorer Mar 09, 2015How to Install a Trailer Wiring Harness on a 2015 Ford Explorer. Then the green wire terminal for the passenger side turn signal and brake. Now we've verified all of our lighting functions work, we're ready to hit the road. That'll do it for the install of the Tow Ready T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector, part number 118540 on our 2015 Ford Explorer. .4.9/5(242)Category: Custom Fit Vehicle WiringBrand: Tekonsha 2015 Ford Explorer Trailer Wire Harness and Connector Equip cars, trucks & SUVs with 2015 Ford Explorer Trailer Wire Harness and Connector from AutoZone. Get Yours Today! We have the best products at the right price.