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Vehicle battery connection required
Warranty: One-Year Limited Warranty
Electrical System Type: 3W
Output Type: 4-Way Flat
Tail Light Circuits: 6.0 Amps
Turn and Brake Circuits: 3.0 Amps
Installation Difficulty: Professional
Installation Time Exact (Minutes): 30
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 XC90 (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 888-634-94942 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2017 - 2025 | Volvo S90 | Installation Time: 30-60 minutes |
| 2016 - 2026 | Volvo XC90 | Installation Time: 30-60 minutes |
The CURT 56285 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Volvo XC90 (Part #BKDK56285) fits the following vehicles: 2017-2025 Volvo S90; 2016-2026 Volvo XC90. Always verify your specific year, make, and model before ordering.
The CURT 56285 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Volvo XC90 (Part #BKDK56285) fits 2017-2025 Volvo S90 models. The 2026 model year is the last year covered by this part number. For newer models, check for an updated version.
Yes, the CURT 56285 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Volvo XC90 (Part #BKDK56285) is designed to fit the 2017-2025 Volvo S90.
The CURT 56285 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Volvo XC90 (Part #BKDK56285) Typical installation time is 30-60 minutes. Basic hand tools are typically all you need.
Yes, the Curt 56285 is designed for the Volvo S90. It is also compatible with the Volvo XC90. The harness is designed for SUVs, mini and full-sized vans (S-series applications).
Yes, the Curt 56285 is designed for the Volvo XC90. It is also compatible with the Volvo S90. The harness is designed for SUVs, mini and full-sized vans (S-series applications).
The signal circuits are rated at 3.0 amps per side. The tail and running circuits are rated at 6.0 amps total. Do not exceed these ratings or the tow vehicle lamp load rating, whichever is lower, as exceeding the product rating can cause loss of warranty, overheating and potential fire.
The tail and running circuits are rated at 6.0 amps total. The signal circuits are rated at 3.0 amps per side. Do not exceed these ratings or the tow vehicle lamp load rating, whichever is lower, as exceeding the product rating can cause loss of warranty, overheating and potential fire.
You will need a ratchet, 10mm socket, 8mm socket, panel trim removal tool, and a cutting tool. A 3/32" drill bit is also required if you need to drill a pilot hole for the ground screw.
Yes, you must disconnect the negative battery terminal before beginning installation. This is a required safety step performed in Step 2 of the installation process.
You must remove: all trunk floor coverings, the driver side access panel (to reach the battery), the rear scuff panel, the storage tray from the passenger side, and the fasteners securing the cargo tie down. The side trim panels must also be pulled back to access the taillight wiring harness connectors.
The custom wiring harness end with the yellow wire is inserted between the separated taillight wiring harness connectors on the driver side, behind the side trim panel. The connectors must be fully inserted with locking tabs in place.
The custom wiring harness end with the green wire is routed to the passenger side behind the removed scuff panels and inserted between the separated taillight wiring harness connectors on the passenger side, following the same procedure as the driver side (yellow wire). The connectors must be fully inserted with locking tabs in place.
Locate a suitable grounding point near the taillight connector, such as an existing screw with nut in the vehicle frame. If no suitable point exists, drill a 3/32" pilot hole. The area must be free of rust, dirt and paint. Secure the white ground wire using the ring terminal and provided screw. Repeat this process on the passenger side.
Drilling may be required. If a suitable existing grounding point (such as a screw with nut in the vehicle frame) is not available near the taillight connector, you must drill a 3/32" pilot hole for the provided ground screw. Before drilling, check for hidden items behind or under any surface to avoid damage and personal injury.
Drill a 3/32" pilot hole for the provided ground screw. The area should be free of rust, dirt and paint. Before drilling, check for hidden items behind or under any surface to avoid damage and personal injury.
The black converter box should be adhered to a flat spot inside the vehicle near the taillight using the provided double-sided tape. This is typically located in the trunk area.
Route the power wire to the battery's positive (+) terminal. Using a 10mm socket, remove the nut on the positive (+) terminal auxiliary stud. Attach the power wire terminal ring and reinstall the nut. The battery connection must be fuse-protected with a 10-amp max fuse.
The battery connection must be fuse-protected with a 10-amp maximum fuse. Exceeding this rating can cause loss of warranty, overheating and potential fire.
When not in use, roll up the 4-flat connector and store it in a convenient, out-of-the-way location. When in use, route it to the center of the vehicle. Secure any loose wires with the provided cable ties.
After installation, test for proper function by using a test light or connecting a properly wired trailer. All installation steps must be followed to ensure the wiring harness functions properly. Reconnect the negative battery terminal and reinstall all items removed during installation.
The Curt 56285 includes the custom wiring harness with yellow and green wire ends, a white ground wire with ring terminal, a provided ground screw, a black converter box, double-sided tape for mounting the converter box, a 4-flat dust cover, and cable ties for securing loose wires.
The battery connection must be fuse-protected with a 10-amp maximum fuse. Exceeding this rating can cause loss of warranty, overheating and potential fire. Do not exceed the product rating or tow vehicle lamp load rating, whichever is lower.
Exceeding the product rating can cause loss of warranty, overheating and potential fire. Do not exceed the signal circuit rating (3.0 amps per side), tail/running circuit rating (6.0 amps total), or the tow vehicle lamp load rating, whichever is lower.
Yes, you should check your vehicle owner's manual or contact the vehicle manufacturer for more information about your specific vehicle's electrical system and lamp load rating before installation.
Yes, the Curt 56285 is designed for both Volvo S90 and XC90 models.
You need a ratchet, 10mm socket, 8mm socket, panel trim removal tool, and cutting tool. A 3/32" drill bit is needed if drilling a ground hole.
Yes, you must disconnect the negative battery terminal before starting installation.
Drilling may be required if no suitable existing ground point is available. You would drill a 3/32" pilot hole for the provided ground screw.
The battery connection must use a 10-amp maximum fuse. Do not exceed this rating.
Signal circuits: 3.0 amps per side. Tail/running circuits: 6.0 amps total. Do not exceed these ratings or the vehicle's lamp load rating.
Test for proper function using a test light or by connecting a properly wired trailer.
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