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2024 - 2026 Buick Envista
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Vehicle battery connection required
Includes fuse holder, battery connection wiring and other necessary wiring components
Includes fuse holder, battery connection wiring and other necessary wiring components
Warranty: One-Year Limited Warranty
Color: Black
Finish: Blank
Electrical System Type: 2W
Tail Light Circuits: 6.0 Amps
Turn and Brake Circuits: 3.0 Amps
Installation Difficulty: Advanced
Installation Time Exact (Minutes): 45
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 Buick Envista (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 |
|---|---|---|
| 2024 - 2026 | Buick Envista | — |
Yes, the CURT Custom Wiring Harness, 4-Way Flat Output, Select Buick Envista 56522 (Part #BKDK56522) is designed to fit the 2024-2026 Buick Envista.
The CURT Custom Wiring Harness, 4-Way Flat Output, Select Buick Envista 56522 (Part #BKDK56522) fits the following vehicles: 2024-2026 Buick Envista. Always verify your specific year, make, and model before ordering.
The CURT Custom Wiring Harness, 4-Way Flat Output, Select Buick Envista 56522 (Part #BKDK56522) fits 2024-2026 Buick Envista 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 Buick Envista 56522 (Part #BKDK56522) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
The Curt 56522 is a wiring converter designed for SUVs and Vans. It converts vehicle lighting signals (turn, brake, and taillight) to a 4-flat trailer connector format. The converter includes a powered module that requires connection to the vehicle battery via a 12-amp fused power lead. It is designed for 12-volt negative ground electrical systems only.
The Curt 56522 is designed for SUVs and Vans. Your vehicle must have a 12-volt negative ground electrical system. The manual does not specify which makes and model years are compatible. Contact Curt Manufacturing or consult a fitment database to confirm compatibility with your specific vehicle before purchasing.
Required tools are: ratchet, 10mm socket, wire strippers, wire cutters, crimping tool, panel trim removal tool, and a cutting tool. You will also need an abrasive pad or paper to clean rust and paint from the grounding point, and you may need a drill with a 3/32-inch bit if an existing grounding screw is not available.
The kit includes: the converter module, a white ground wire with ring terminal, a black 12 GA power wire, yellow, green, brown, and 4-flat signal wires, a 4-flat dust cover, double-sided tape for mounting the converter, cable ties for securing wires, a ground screw, provided sealant for the grommet, and a 10-amp fuse holder. A ring terminal for battery connection is also included.
Yes. Step 1 requires you to locate the vehicle battery on the driver side under the hood and disconnect the negative battery terminal. Fasten this wire down and away from the battery. The battery must remain disconnected until all wiring is complete and you are ready to test the system.
You must remove the floor board to expose the spare tire, using a panel trim removal tool to loosen the threshold and remove it straight up. Use a 10mm socket to remove the cargo hold-downs. Use a trim tool to loosen the side wall trim on both sides of the vehicle. These removals provide access to the taillight housings and routing paths for the signal wires.
Locate the taillight housing secured with push fasteners to the side wall. Separate the connectors carefully, taking care not to damage the locking tabs. Release the external red lock by moving the red tab towards the housing wire. Press the internal lock to unlock the housings. The housings release easier if you push them together, press the lock release until it clicks, and then pull them apart.
The yellow wire (left turn) is installed between the disconnected factory wiring at the driver side taillight. The green wire (right turn) is routed to the passenger side taillight and installed between the factory wiring there. The brown wire (taillight) is routed from the grommet in the rear trunk hatch to the driver side taillight and installed between the factory wiring. All three wires are routed along the back wall of the vehicle under the threshold.
Route the 4-flat connector wire to the center of the vehicle near the receiver hitch. The 4-flat is the main trailer connector and should be positioned for easy access at the rear of the vehicle. After installation, install the provided 4-flat dust cover to help prevent corrosion.
After routing the custom wiring end with brown and red wires through the grommet behind the taillight, reseat the grommet. Use the provided sealant to seal the cut in the grommet and around all the wires. This prevents water intrusion and protects the wiring.
Mount the converter using the provided double-sided tape on the driver side trunk area behind the side wall panel. The converter should be positioned in a location that is accessible and protected from moisture and damage.
Drilling may be required for the ground wire connection. You must locate a grounding point such as an existing screw or bolt in the frame of the vehicle. If no existing fastener is available, drill a 3/32-inch pilot hole. The area must be free from rust, dirt, and paint; use an abrasive pad or paper to clean it. Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury.
Yes. In Step 9, you must locate the grommet behind the taillight where the vehicle taillight wiring passes through from inside the cabin to the taillight. Remove the grommet and cut a slit large enough to route the new custom wiring end through. After inserting the wiring, reseat the grommet and use the provided sealant to seal the cut and around all wires.
The manual specifies that you secure the white ground wire with the ring terminal on an existing fastener or with the provided ground screw. If drilling is necessary, drill a 3/32-inch pilot hole. The manual does not provide a torque specification for the ground screw. Ensure the connection is tight and the area is clean and free from rust, dirt, and paint.
The wiring colors are: Yellow = Left turn signal, Green = Right turn signal, Red = Brake signal, Brown = Taillight/running light. The white wire is the ground wire. The black wire is the 12 GA power wire that connects to the vehicle battery positive terminal. All signal wires are routed to the appropriate taillight housings or the converter module.
Signal circuits are rated at 3.0 amps per side. Tail/running circuits are rated at 6.0 amps total. Do not exceed the product rating or the tow vehicle lamp load rating, whichever is lower. Exceeding the product rating can cause loss of warranty, overheating, and potential fire.
The battery connection must be fuse-protected with a 10-amp maximum fuse. A fuse holder with a 10-amp fuse is provided. Install the fuse after all other installation steps are complete. Do not exceed 10 amps, as exceeding the product rating can cause loss of warranty, overheating, and potential fire.
Route the 12 GA black power wire from the vehicle battery as shown on the provided 'Powered Converter Lead Instruction Sheet' on page 5 of the manual. Route the wire taking care to avoid any pinch points and hot or rotating components. When passing the power wire through sheet metal, use an existing grommet, add a grommet, or use silicone to protect the power wire from sharp edges. Secure the power wire to the vehicle chassis using the provided cable ties.
Use a ring terminal for the battery connection. The black 12 GA power wire has a ring terminal that must be attached to the vehicle battery positive (+) terminal. The white ground wire also has a ring terminal that must be attached to the vehicle body using the provided screw or an existing fastener.
Do not lay tools across the positive battery terminal (typically noted with red covers or a '+' 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 beginning installation and keep it disconnected until all wiring is complete.
No. The converter system is to be used only on 12-volt negative ground systems. It is not compatible with positive ground vehicles. Verify your vehicle has a negative ground electrical system before purchasing or installing this product.
Once all 12-volt power wiring 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. The manual specifies that all steps must be followed to ensure the product will function properly. Test each signal (left turn, right turn, brake, and taillight) to confirm proper operation before final use.
After testing the system with a test light, 4-flat tester, or functioning trailer, secure the green, brown, and 4-flat wires with the provided cable ties. Reinstall all items removed during installation, including the floor board, threshold, cargo hold-downs, and side wall trim. Reconnect the negative battery terminal if it was disconnected at the beginning. Install the provided 4-flat dust cover to help prevent corrosion.
Periodic inspection of all wires and connections should be performed to ensure there is no visible damage or loose connections. Check the 4-flat connector and dust cover regularly to prevent corrosion. Verify that all cable ties are secure and that no wires have shifted or become pinched.
The Curt 56522 is designed for SUVs and Vans with 12-volt negative ground electrical systems. Confirm your vehicle's compatibility with Curt Manufacturing or a fitment database before purchasing.
Yes, disconnect the negative battery terminal before starting installation. Keep it disconnected until all wiring is complete and you are ready to test the system.
The battery connection must use a 10-amp maximum fuse. Install the fuse after all other steps are complete. Do not exceed 10 amps.
Signal circuits: 3.0 amps per side. Tail/running circuits: 6.0 amps total. Do not exceed these ratings or the tow vehicle lamp load rating, whichever is lower.
The Curt 56522 is designed for 12-volt negative ground systems only. It is not compatible with positive ground vehicles.
The manual notes that the housings tend to release easier if you push the housings together and press the lock release until it clicks before pulling them apart. If they remain stuck, ensure you are pressing the internal lock fully and moving the external red tab completely towards the housing wire. Do not force the connectors apart, as this can damage the locking tabs.
Verify that all steps have been followed completely. Check that the negative battery terminal is reconnected and the 10-amp fuse is installed in the fuse holder. Test the system with a test light, 4-flat tester, or functioning trailer to identify which signals (left turn, right turn, brake, or taillight) are not working. Inspect all wire connections at the taillight housings and converter to ensure they are fully seated and the locking tabs are in place. Check that the ground wire ring terminal is securely attached to a clean, rust-free surface.
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