In this video I show you how to find your 12 V charger wire on your 2015 to 2017 Ford F-150. For some reason ford decided not to install the 12 V charger wire on the seven way trailer connecter on the back of your truck in order to resolve this problem we will now take this wire and install a relay along with 12v and create a 12 V ignition powered trailer charge wire that runs through your factory wiring loom.