I need to know the tail light wiring diagram for a 2013 I need to know the tail light wiring diagram for a 2013 ford f150 FX4. Put led bulbs in and clipped in the the load equalizers in both tailight sockets on one side and they still flash fast. Show More Free Ford Wiring Diagrams - Carsut Looking for free Ford wiring diagrams? Here you go. As these are the free wiring diagrams, they are not full version but they are part and parcel of owning a Ford car. These wiring diagrams are very handy when it comes to fixing an alternator, replacing a radio, repairing a car stereo, changing a tail light or adding an extra spotlight.