I have a 2017 3.5L Limited with the towing option. I have no voltage on either the 4 pin or 7 pin connections when the vehicle lights are on. I checked the lights with this vehicle this Spring and they all worked. Now there's nothing. I checked the trailer lights with a 12vdc source, they all work fine. I checked the 15A fuse (#70) in the fuse box under the hood, the fuse is good and there is 12v on the terminals.