Thanks G. I am thinking that is the issue. I went out last night with my volt meter and tested the Brake/right turn/and left turn pins from my 4 pin plug coming out of my truck. All had power except my left signal. I looked through my owners manual, and there is a fuse that is responsible for my left turn/brake tow trailer. FYI 2006 Ford f-150. Wanted to post stuff like this in case this happens to someone else. Will check the fuse tonight and post on here the result. Thanks again for all the responses.