Tekonsha 119251 Modulite ZCI Trailer Lite Power

The Intelligent Choice ZCI is the only product in the industry that has ZERO contact with the vehicle's lighting system. ZCI uses sensors that simply SNAP around the wires, NO DIRECT CONTACT. ZCI only detects if current is present in the wire. Therefore, there is ZERO chance of feedback to the vehicle. It works with all known vehicle systems, including standard 2 or 3 wire systems, PWM (pulse width modulation) systems, Multiplexing (2 or 3 wire systems) and Low Side Switching. Many vehicles, one solution!