WARNING: Will not work with all 2016 2021 Mercedes GLC300 models. Will not work with vehicles with low-side switch. COMPATIBILITY: Universal ModuLite designed to be used on most vehicles plus the hard to wire vehicles. Advanced circuitry works in all standard applications as well as vehicles with ST and STT pulse width modulation (PWM) systems. Interprets/decodes multiplex signal inputs (i.e. Audi, BMW, Mercedes and VW). FUNCTIONALITY: The unit is rated for up to 4.2 amps for Turns/Stops circuits and 7.5 amps for the Taillight circuit. Draws power directly from the vehicle battery and uses less than 5mA of the vehicle circuit for sensing to turn the trailer functions on and off. Will work with either LED/Incandescent bulbs (vehicle & trailer). DESIGNED: Has integrated re-settable Short Circuit and Overload protection, to safeguard itself and the tow vehicle from shorts and installation wiring mishaps. Designed not to send feedback thru the vehicle circuits. The trailer brakes will override the hazard lamps when the brake is activated. SECURED: All solid-state components in potted encapsulation. Includes integrated protective cover.