ktarr72590

Ok guys. Lookin for more help. I ordered a new towing harness for my 2007 f150 xlt. I got the 4 pin harness as I have no need for the 7 pin. It has been hooked up and installed. All my rear lighting works, turn signals, 4ways, breaks, reverse, running lights, but to the trailer it does not. I only have a left turn signal and break lights. Any input as to why this is? Does it have to do with the relays that are talked about in this post?
http://www.f150online.com/forums/towing-hauling/446376-2007-f150-quick-trailer-wiring-install.html