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A small black rectangular wiring harness with a flat four-pin trailer connector and two relay modules, shown coiled in a clear bag

CARROFIX

CARROFIX 4-Pole Flat Trailer Wiring Harness for 2018-2022 Chevy Equinox GMC Terrain

SKU CH-39K9-YP04H

Provides a 4-pole flat trailer connector for 2018-2022 Chevy Equinox and GMC Terrain with factory tow package, plugging directly into the vehicle harness without cutting or splicing wires

  • Type4 pin trailer wiring harness
  • Custom fit for 2018-2022 Chevy Equinox and GMC Terrain with factory tow package
  • Plug-n-play installation connects directly to factory harness behind bumper with no cutting or splicing required
  • Includes two relays to activate trailer lighting functions and a dust cap to protect the 4-way flat connector
  • Provides 4-pole flat trailer connector for turn signals, brake lights and taillights
  • Compact harness measures 5.51 x 2.64 x 2.05 inches and weighs 5.78 ounces

Vehicle-Specific Fitment

This CARROFIX wiring harness is built for 2018-2022 Chevrolet Equinox and GMC Terrain models equipped with a factory tow package. It supplies a 4-pole flat trailer connector at the rear of the vehicle to operate trailer signal lights. The custom-fit design plugs directly into the existing factory harness behind the bumper. No cutting, splicing or tapping of vehicle wires is required for installation.

Sustained Towing Reliability

The harness includes two relays that activate lighting functions and draw power through the vehicle's fused circuits rather than the factory wiring alone. This protects the vehicle's electrical system during extended periods of trailer use. A dust cap covers the 4-way flat connector when not in use, keeping the contacts clean and functional for repeated hookups. The plug-in design maintains a secure connection over long distances.

Thermal and Electrical Load

Power flows through the factory tow-package wiring and the supplied relays, keeping current draw within the vehicle's original circuit limits. The harness adds no extra heating load to the vehicle's lighting circuits during normal operation. Installation requires opening the fuse box to insert the relays, after which the connector stows beneath the vehicle near the hitch. No special tools are needed for the complete setup.

Highlights

  • Custom fit for 2018-2022 Chevy Equinox and GMC Terrain with factory tow package
  • Plug-n-play installation connects directly to factory harness behind bumper with no cutting or splicing required
  • Includes two relays to activate trailer lighting functions and a dust cap to protect the 4-way flat connector
  • Provides 4-pole flat trailer connector for turn signals, brake lights and taillights
  • Compact harness measures 5.51 x 2.64 x 2.05 inches and weighs 5.78 ounces

Specifications

Type4 pin trailer wiring harness

Questions about this item

Does the 4-pole flat connector draw noticeable power from the vehicle when the trailer is not attached?

The harness only completes a circuit when a trailer is plugged in, so there is no continuous draw from the connector itself.

My 2018 Equinox has the factory tow package — is anything else required to make this harness work?

You need access to the factory connector behind the rear bumper on the driver side and the fuse box to install the two included relays.

Will the included relays interfere with any factory lighting modules already on the vehicle?

The relays plug into the specified fuse-box positions and are designed to work alongside the original lighting system without conflict.

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