Cargo floor panels, threshold trim, battery covers, anchors, and the necessary rear side panels are removed or loosened to reach the taillight circuits, protected module location, and the vehicle’s rear 12-volt battery system.

The passive-wiring control module is mounted inside the cargo area in a protected location. Its output harness is routed through a factory rear grommet and secured beneath the vehicle toward the Stealth Hitch frame and connector position.

The appropriate left-turn, right-turn, running-light, and brake-light circuits are verified for the specific X3 before the module inputs are connected. This matters because BMW wire colors and configurations can vary by model and trim.

The module ground is secured to a suitable vehicle grounding point, and its power lead is connected only to the correct rear 12-volt battery terminal. Any higher-voltage vehicle components are identified and left untouched.

The 7-way receptacle is assembled in the correct terminal configuration, mounted to the Stealth Hitch frame, and tested for running lights, brake lights, both turn signals, ground, 12-volt power, and available brake output. Wiring and trim are then secured and reassembled, with the included 7-way-to-4-flat adapter ready for smaller trailers and accessories.