trailer light issues
 

I'm trying to wire my 99 for my trailer. The original plug was half ass wired in. We'll I think my problem may be this Lil black box that is upstream from my plug. I have a pic, but can't figure how to upload it. I need to know what th is part is called.... I have power running to box, but no power comin out of right turn/brake. If anyone knows what this part is called and/or priced that would be awesome. Thanks.