Hello All, Newbie to this forum. Just purchased an '03 Sub and will be pulling a pop-up camper with it. My question is in reference to the factory trailer wiring harness. In the owner's manual is the following statement: If your trailer is equipped with electronic brakes, you can get a jumper harness (electric trailer brake control) with a trailer battery feed fuse from your dealer. This harness and fuse should be installed by your dealer or a qualified service center. I understand that GM P/N 15085418 is this harness....and I understand that I can use this harness to directly wire in my brake controller......my question is, does anyone know if this harness also supplies 12vdc to the auxillary post of the rear mounted RV connector? As well, does anyone know if specific connection diagrams comes with this harness or does anyone have a link for such? Thanks much for your time!!