Check the listing for details. Curt 51531 Brake Control Harness Univ 1 Plug w/Pigtail Includes 24" 12 Ga Wire. Condition: New. Listed at 43.98 USD. It takes a lot of power to stop a moving trailer, especially when that trailer is hauling livestock, construction materials, industrial equipment or other heavy-duty cargo. Play it safe when you tow and give your trailer brakes the control they need with a CURT trailer brake controller and brake controller harness. CURT quick plug brake controller harnesses make the installation of your brake controller easy. This brake controller harness comes with pigtails to splice into your vehicle's electrical system. When a CURT quick plug harness is not a compatible option for your vehicle, a quick plug with pigtails is the next best thing. These harnesses feature a quick plug end to easily snap into your CURT brake control and colored wires to coordinate with the appropriate electrical function.