Description
The CURT 56377 custom trailer wiring harness adds a 4-way flat lighting connector to compatible Mazda CX-5 SUVs. Its vehicle-specific connectors plug into the left and right rear taillight assemblies, allowing the powered converter to operate trailer running, brake and turn-signal lights without cutting factory lamp wires.
Verified Mazda CX-5 Fitment
- 2017–2021 Mazda CX-5: CURT lists all styles in these years for part 56377.
- Check the year and taillight connector arrangement before ordering. Do not assume the same kit fits later CX-5 generations or an unlisted model year.
Specifications and Included Wiring
- Manufacturer MPN: 56377; 4-way flat trailer-lighting output.
- Vehicle-specific taillight T-connectors and a circuit-protected, powered converter.
- Vehicle battery connection required. Includes power wiring and a fuse holder; the manufacturer specifies a fuse-protected connection.
- Manufacturer circuit ratings: 6 amps for tail/running lights and 3 amps for turn/brake circuits.
- Rubber 4-flat dust cover included; CURT limited one-year warranty.
Installation Notes
Access the rear taillight connectors as directed in the supplied installation instructions. Secure the power feed, converter and cable routing away from hot or moving components, then test all trailer lighting functions. This harness is not a 7-way socket or electric trailer brake controller.
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