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ModuLite ZCI Xero Contact Interface Universal Power Modules use a direct connection to the tow vehicle's battery to power the trailer's stop, turn, tail and running lights, with absolutely zero contact with the tow vehicle's electrical system! Sensors snapped over vehicle wires sense application of electrical current and engage the trailer lights. No cutting or splicing of vehicle wiring! Perfect for leased vehicles. Use a ModuLite module when: your trailer has more than one light assembly per side, and is equipped with multiple clearance or running lights; if tow vehicle tows a variety of trailers; if tow vehicle has 'lamp out' sensors or other sensitive electronics that could be damaged by increased electrical draw. ModuLite has integrated, re-settable short circuit and overload protection - safeguards itself and the tow vehicle from shorts and wiring installation mishaps. Rated at up to 4.2 amps for turn/stop circuits and 7.5 amps for the taillight circuit. Works on all vehicle types including standard, PWM and/or multiplex systems, ensuring full brightness of the trailer lights during operation. Adapts import and domestic vehicles with separate turn and stop lights (3 wire system) to standard trailer taillight wiring (2 wire system). Compatible with either LED and/or incandescent bulbs on both tow vehicle and trailer. Works with vehicles that have a low-side switch. Includes comprehensive installation instructions. Backed by Tekonsha's 1 Year Limited Warranty. From it's humble origins as a manufacturer of RV stairs and steps in 1964, Tekonsha has evolved to become a trusted name in towing safety. The core product line consists of brake controllers, electrical wiring and trailer brakes. The Tekonsha line has long been trusted by professional towers and weekend warriors for worry-free travel.