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Wiring components
Dust cover
| Warranty | One-Year Limited |
| Connector Type | Male Female |
| Terminal Style | Pin |
| Electrical System | 3-wire |
| Tail Light Circuit Capacity | 6.0 Amps |
| Converter Features | Circuit Protected, Powered, Potted |
| Package Type | Packaged |
| Warranty | One-Year Limited |
| T-Connector Position | S3, S4 |
| Material Type | Thermoplastic Rubber |
| Vehicle Compatibility | Volvo XC60 (specific years) |
If your vehicle is not equipped with wiring for towing a trailer, CURT custom wiring is the ideal solution. A custom wiring harness -- also called a T-connector -- is a simple, plug-and-play electrical device that plugs into your automotive electric system and provides a standard, universal trailer wiring connection.
This is done using two or more vehicle-specific, OEM-compatible connectors to plug into the taillight assembly, eliminating the need for cutting, splicing and soldering during installation. Custom wiring harnesses are made vehicle-specific, and while they are not available for all vehicles, they do offer one of the fastest, easiest and most secure ways to wire a vehicle for towing.
This particular plug-in harness provides a 4-way flat connector socket and is designed to be a custom wiring harness to fit certain years of the Volvo XC60 (to verify your vehicle compatibility, see application info). It comes with all necessary wiring components to establish a reliable trailer wiring connection, as well as a dust cover to keep the connector clean when not in use.
You have a picture in mind of your next destination -- maybe it's the boat landing at your favorite fishing spot, maybe it's a campsite that overlooks one of nature's masterpieces, or maybe it's the next big jobsite. However, turning that picture into a reality takes more than just daydreaming. It takes a solid connection and the right amount of power. CURT custom wiring is made with some of the most sophisticated technology in the industry and is designed to install with ease, giving you a long-lasting electrical connection for your towing hitch setup.
CURT offers a variety of high-quality trailer hitches and accessories for select vehicle models. Find the perfect fit for your towing needs at TowUniverse.
CURT, a Lippert brand, offers a complete line of towing products and is the leading manufacturer of custom-fit trailer hitches. We offer the broadest selection of custom-fit hitches, and each one is designed, welded, and coated in Wisconsin.
CURT is also a leader in flat towing products, as well as 5th wheel, gooseneck, and weight distribution hitches, ball mounts, electrical components, cargo solutions, and other towing accessories.
For everything from passenger cars and vans to full-size pickups and SUVs, CURT is 'The First Name in Towing Products®.'
Experts available to answer your questions
Call 888-634-9494One-Year Limited
1 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2018 - 2026 | Volvo XC60 | Installation Time: 30-60 minutes |
The CURT Custom Wiring Harness, 4-Way Flat Output, Select Volvo XC60 56531 (Part #BKDK56531) fits 2018-2026 Volvo XC60 models. The 2026 model year is the last year covered by this part number. For newer models, check for an updated version.
The CURT Custom Wiring Harness, 4-Way Flat Output, Select Volvo XC60 56531 (Part #BKDK56531) fits the following vehicles: 2018-2026 Volvo XC60. Always verify your specific year, make, and model before ordering.
Yes, the CURT Custom Wiring Harness, 4-Way Flat Output, Select Volvo XC60 56531 (Part #BKDK56531) is designed to fit the 2018-2026 Volvo XC60.
The CURT Custom Wiring Harness, 4-Way Flat Output, Select Volvo XC60 56531 (Part #BKDK56531) Typical installation time is 30-60 minutes. Basic hand tools are typically all you need.
The Curt 56531 is a custom wiring harness with a powered converter module designed for SUVs and vans. It provides signal circuits for turn signals and tail/running lights, and includes a converter that can be used as a powered module for two-wire trailer brake systems. The system uses a 4-flat connector for trailer connection.
The Curt 56531 is designed for SUVs and vans. The manual specifies wiring locations for these vehicle types (S-series locations). To confirm compatibility with your specific vehicle make and model year, contact Curt Manufacturing or consult a fitment database, as the manual does not list specific vehicle applications.
The converter system must be used only on 12-volt negative ground electrical systems. If your vehicle uses a different electrical system, this product is not compatible.
Required tools are: ratchet, ratchet extension, 10mm socket, 8mm socket, wire cutter, wire stripper, crimping tool, cutting tool, panel trim removal tool, and small flathead screwdriver. Proper tools will improve installation quality and reduce time required.
The kit includes: custom wiring harness with yellow, green, white, black, red, and brown wires; black converter box; double-sided tape for mounting the converter; cable ties for securing wires; ground screw; ring terminal for ground connection; 4-flat dust cover; and a 10-amp fuse holder. A 10-amp fuse must be installed after all other installation steps are complete.
Yes. You must disconnect the negative battery terminal before beginning installation. Fasten this wire down and away from the battery during the installation process. Reconnect the negative battery terminal only after all other steps are complete and before testing.
Yes. You must open the rear hatch, remove the spare tire access cover, remove the spare tire hold-down, and remove the spare tire to access the battery for disconnection. The 4-flat connector will later be stored under the floor board in the spare tire area when not towing.
The custom wiring harness with the yellow wire is inserted between the separated taillight connectors (driver and passenger side). The harness with the green wire is routed to the passenger side along the rear hatch, then up the side wall to the passenger side harness and taillight. Use provided cable ties to secure loose wires and keep the harness up and out of the way. The 4-flat connector is routed to the spare tire area and stored under the floor board when not towing, routed out of the vehicle hatch without contacting the hatch locking mechanism.
Locate the vehicle's taillight wiring connectors behind the taillight housings (access by removing the side wall circular foam insert using a trim panel removal tool). Separate the connectors from the taillight housing, taking care not to damage the locking tabs. Insert the custom wiring end with the yellow wire between the separated connectors. Ensure the connectors are fully inserted with their locking tabs in place. Repeat on both driver and passenger sides.
Locate a flat spot inside the vehicle near the taillight. Adhere the black converter box using the provided double-sided tape. The manual does not specify other mounting locations.
Drilling may be required for the ground connection. You must locate a grounding point such as an existing screw or bolt in the vehicle frame. If no suitable existing fastener is available, drill a 3/32" pilot hole. The area must be free from rust, dirt, and paint; use an abrasive pad or paper to remove rust and paint before securing the white ground wire with the ring terminal. Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury.
If drilling is necessary for the ground connection, the pilot hole size is 3/32".
The harness includes six wires with the following functions: Yellow = Left turn signal; Green = Right turn signal; Red = Brake signal; Brown = Tail/running lights; White = Ground; Black = Power (12-volt positive from battery). The white ground wire has a ring terminal for secure connection to the vehicle frame.
The battery connection must be fuse-protected with a maximum 10-amp fuse. The kit includes a 10-amp fuse holder. Exceeding this rating can cause loss of warranty, overheating, and potential fire. Install the fuse after all other installation steps are complete.
Signal circuits (turn signals): 3.0 amps per side. Tail/running circuits: 6.0 amps total. Do not exceed the product rating or the tow vehicle lamp load rating, whichever is lower.
The power wire from the vehicle battery must be 12 GA (12 gauge) or larger. Route this wire to the vehicle battery location, taking care to avoid pinch points and hot or rotating components.
When passing the power wire through sheet metal, use an existing grommet, add a new grommet, or use silicone to protect the power wire from sharp edges.
If using the converter as a powered module for a two-wire system, the red brake wire must be grounded.
Do not lay tools across the positive battery terminal (typically noted with red covers or a red '+' symbol), as this can cause a ground short, resulting in sparks and/or electrical shocks. Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury. When routing the power wire, avoid pinch points and hot or rotating components. Disconnect the negative battery terminal before wiring the power wire. Do not exceed the product rating or tow vehicle lamp load rating.
Once the 12-volt power wire is connected to the harness, verify that the harness is functioning by attaching the battery and testing with a test light, 4-flat tester, or a functioning trailer. All steps must be followed to ensure the product will function properly.
After installation, verify that all connectors are fully inserted with their locking tabs in place. Test the harness with a test light, 4-flat tester, or functioning trailer. Ensure the 4-flat connector is stored under the floor board in the spare tire area when not towing, and routed out of the vehicle hatch without contacting the hatch locking mechanism. Reinstall all items removed during installation, including the spare tire, floor board, threshold, and foam insert.
Periodic inspection of all wires and connections should be performed to ensure there is no visible damage or loose connections. Install the provided 4-flat dust cover to help prevent corrosion.
The Curt 56531 is designed for SUVs and vans with 12-volt negative ground electrical systems. Confirm your specific vehicle make and model with Curt Manufacturing or a fitment database.
Yes, you must disconnect the negative battery terminal before installation and reconnect it only after all other steps are complete.
Use 12 GA (12 gauge) wire or larger for the power connection from the vehicle battery.
Do not lay tools across the positive battery terminal, as this can cause a ground short and sparks or electrical shocks. Disconnect the negative battery before wiring. Do not exceed the product rating or tow vehicle lamp load rating.
Verify that the harness is functioning by testing with a test light, 4-flat tester, or a functioning trailer. Ensure all connectors are fully inserted with their locking tabs in place. Check that the 10-amp fuse is installed in the fuse holder. Verify that the white ground wire is securely connected to the vehicle frame. Confirm that the black power wire is connected to the positive battery terminal with a ring terminal and that the negative battery terminal is reconnected. Check for visible damage or loose connections in all wires.
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