What kind of trailer harness do you have at the back. You should have a 4/5 pin and a 7 pin. Your 7 pin will have you standard, running, brake, L and R signals, and brake inputs. If there is an 8th pin it's for reverse. Most newer trucks have an option for factory brake controller. This could be why you have two wires with no connectors. You should be able follow those two empty wires to your 7 pin. You can wire in but it may not allow for your trailer to signal the brakes until an actual trailer is connected in the pin receiver in the bumper.
Hope this helps
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