Trailer Wiring Harness Installation - 2011 Ford Edge Video Mar 31, 2016How to Install a Trailer Wiring Harness on a 2011 Ford Edge. Today on this 2011 Ford Edge, we're going to review and install the T1 Vehicle Wiring Harness from Towready, part number 118515. This is what you need when you want to tow a trailer behind your Ford Edge.4.8/5(86)Category: Custom Fit Vehicle WiringBrand: Tekonsha 2011 Ford Edge Trailer Wiring | etrailer Lowest Price Trailer Wiring Guarantee. Installation instructions and lifetime expert support on all purchases of 2011 Ford Edge Trailer Wiring. Order online at etrailer.com or call 800-298-8924.