Works with These Hard To Wire Vehicles: * 04-08 BMW X3 * 00-06 BMW X5 * 07-08 Mercedes-Benz R320 CDI * 07-08 Mercedes-Benz R320 CDI with Panoramic Roof Package * 06-08 Mercedes-Benz R350 * 06-08 Mercedes-Benz R350 with Panoramic Roof Package * 06-07 Mercedes-Benz R500 with Panoramic Roof Package * 06-07 Mercedes-Benz R500 * 07-08 Volkswagen GTI 2 Door Hatchback * 06-08 Volkswagen Passat All, Except 4 Motion * 07-08 Volkswagen Passat Wagon All, Except 4 Motion Please note this product does not ship to Pennsylvania. HEAVY DUTY MODULITE POWER MODULES WITH CIRCUIT PROTECTIONS * Universal Modulite designed to be used on most vehicles plus the hard to wire vehicles * Converts vehicle functions from a 3 wire system to a trailer 2 wire system * Can also be used on 2 wire vehicle systems * Draws Power directly from the vehicle battery and only uses less then 5 milliamps of the vehicle circuit for sensing to turn the trailer functions on and off * Heavy-Duty! Rated for up to 4.2 amps for Turns/Stop circuits and 7.5 amps for the Taillight circuit * Has integrated re-settable Short Circuit and Overload protection, to safeguard itself and the tow vehicle from shorts and installation wiring mishaps * All-solid state components in potted encapsulation * Works with either LED or Incandescent bulbs (input/output) * Upgraded taillight circuit works with vehicles that use pulse width modulation (PWM); this gives trailer lights full brightness * Designed not to send feedback thru the vehicle circuits