Curt 56533 Custom 4-Way Flat Wiring Harness - 2018-2021 BMW X3

Why Choose the Curt 56533 Custom Wiring Harness?

The Curt 56533 provides a vehicle-specific trailer-light connection for 2018-2021 BMW X3 models. OEM-compatible T-connectors plug directly into the vehicle's taillight wiring to provide a standard 4-way flat trailer connector without cutting or splicing the factory signal circuits.

An integrated powered converter draws trailer-light power from the vehicle battery to help protect the factory electrical system. The potted, circuit-protected, PWM-compatible module uses surface-mount technology for reliable performance with modern vehicle lighting systems.

Key Features & Benefits

• Vehicle-Specific T-Connector: Designed for 2018-2021 BMW X3 models
• 4-Way Flat Trailer Connector: Powers trailer tail lights, brake lights, and turn signals
• No Signal-Wire Cutting or Splicing: OEM-compatible connectors plug directly into the vehicle's taillight assemblies
• Powered Converter: Draws trailer-light power directly from the vehicle battery
• Potted & Circuit Protected: Helps protect converter electronics from vibration and electrical faults
• PWM Compatible: Designed for compatibility with pulse-width-modulated vehicle lighting systems
• Surface-Mount Technology: SMT circuitry helps improve electrical performance and durability
• 7.5-Amp Tail Light Circuit: Provides rated output for trailer running and tail lights
• 5-Amp Brake / Turn Circuits: Supports compatible trailer stop and turn signal lamps
• Dust Cover Included: Helps protect the 4-way flat contacts when disconnected

Technical Specifications