Helo I have a 2012 Ford F150 FX4 When I bought the pickup I did not have it, now I bought the factory subwoofer but I can not find the cable to connect it under the back seat, they know if all the models come with a factory amplifier and where it is placed, or if it is necessary or I can connect the factory subwoofer in some easy way

 

This is Subwoofer conector