T-One T-Connector Custom Harness for BMW X3. Equip your luxury SUV for the road with this professional 4-way flat trailer wiring kit. Designed for a perfect fit, this T-One harness utilizes OEM-compatible connectors that "T" directly into your vehicle's existing wiring—eliminating the need for cutting or soldering. The integrated ModuLite HD module protects your X3's electrical system by bypassing the factory light circuits and pulling power directly from the battery. This ensures maximum safety and reliability for your trailer's brake lights, turn signals, and tail lights, all while maintaining the integrity of your vehicle's factory warranty.
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