2011 wiring harness

Hello I'm new to the site and I'm having trouble with my 11 Rock warrior trailer lights. Wondering how to trace the harness for problems and where to look at connections beyond the two at the rear that connect to the receptical. Are there other connecting points? Where do trailer wires tie into the turn signals and brake? I've checked every fuse but haven't the relays no idea where they are? I have running lights only at the 7 and 4 pin.

 

Welcome from LA (Lower Alabama)! Here is a thread with links to tons of wiring diagrams to help you in your search:
https://www.tundras.com/threads/ultimate-wiring-diagrams-collection.81448/