Trailer light problems, please help

Hi Folks I am having a continual problem and cant figure it out. I have a 04 Titan with factory tow package. The truck continually blows the rt trailer turn fuse in the bcm harness (had bcm recall performed). I have swapped the relays right to left with no change. I have verified the trailer wiring is correct. It does it with both my trailers also.It seems this is a common problems but I have not seen any resolution in any posts. I have performed a visual inspection from the bcm harness, along the frame to the rear connector and it's fine. I have power on the right turn at the connector without the trailer hooked up, but once the connector is hooked to the trailer it blows the fuse. Sounds like a trailer issue but I am certain its not. PLEASE HELP!!