2011 Ford Fiesta Trailer Wiring | etrailer Lowest Price Trailer Wiring Guarantee. Installation instructions and lifetime expert support on all purchases of 2011 Ford Fiesta Trailer Wiring. Order online at etrailer or call 800-298-8924. 2011- Ford Fiesta Vehicle Wiring Chart and Diagram Printer Friendly Version Listed below is the vehicle specific wiring diagram for your car alarm, remote starter or keyless entry installation into your 2011- Ford Fiesta. This information outlines the wires location, color and polarity to help you identify the proper connection spots in the vehicle.