Tekonsha ZCI Zero Contact Interface Universal ModuLite - Universal Trailer Light Power Module [119250]ZCI Zero Contact Interface Universal ModuLite Universal Trailer Light Power Module ZCI sensor technology and direct connection to the tow vehicle battery, eliminates all electrical connection and interference with the tow vehicle electrical system. Vehicles with 12 volt system only. Features: NO CUTTING OR SPLICING VEHICLE WIRING! Isolates Trailer Light Operation from Tow Vehicle's Electrical System Works with 2 or 3 wire systems Works with PWM or