So this is what we are talking about,,,you grounded the white wire correct? and no power to tail or turn signals. Have you checked the trailer fuses/relays yet? I'm looking up wiring I'll be back shortly.
Ok you need to check some fuses to make sure they are OK. I'll include the diagrams, check every fuse related to trailer adaptor. Under hood fuse box fuses 5, 19, 20, 101, 108. Swap relays around to see if that makes a difference.