which wires do i tap in to for trailer brake box. i use factory trailer light connector.i put in both relys for lights & brakes. thank you k haynes

What is the year and model of your Titan? Some have the harness with the plug and some don't.

it 05 xe titan . i think its in harness .if so which wires and where. thank you k haynes

Buy the plug from Nissan and it is only $6.00 or something and the wires are marked as to their function.