Our in-house experts typically reply within one business day.
CURT
Verify Fitment
Select your vehicle to confirm this part fits.
2025 - 2026 Kia Carnival
Confirmed to Fit
Always the correct part
We know our products
Quality Products
Free Shipping!
Always the correct part
We know our products
Quality Products
Free Shipping!
Includes fuse holder and other necessary wiring components
Includes fuse holder and other necessary wiring components
Warranty: One-Year Limited Warranty
Output Type: 7-Way RV Blade
Tail Light Circuits: 7.5 Amps
Turn and Brake Circuits: 5.0 Amps
Installation Time Exact (Minutes): 0
Making memories doesn't start when you reach your destination; it starts at the very first mile of your journey. Wherever your road begins and wherever it takes you, Bring It® with the power of CURT. CURT custom wiring provides everything you need to connect your vehicle's electrical system to a trailer. With plug-and-play connectors, a custom wiring harness easily integrates with your vehicle taillights to provide a standard trailer wiring connector, typically in the form of a 4-way flat. This custom wiring harness features a vehicle-specific design to perfectly fit certain years of the Kia Carnival without LED taillights (to verify vehicle compatibility, see the CURT application guide or use the Vehicle Lookup on the CURT website). It uses OEM-compatible connectors to "T" into the vehicle's taillight assembly and provides a standard 4-way flat output to power the taillights, brake lights and turn signals on your trailer. To complete this custom wiring harness, it comes with a rubber dust cover. This cover keeps the connection points clean and well protected when the connector is not in use. Once installed, the connector can also be conveniently mounted on the vehicle's trailer hitch receiver tube, using a CURT Easy-Mount connector bracket. The bracket mounts onto the trailer hitch with no drilling required, and its powder-coated steel construction provides a solid attachment point for plugging in the trailer wiring.
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 |
|---|---|---|
| 2025 - 2026 | Kia Carnival | — |
Yes, the CURT Custom Wiring Harness, 4-Way Flat, Select Kia Carnival without LED Taillights #56551 (Part #BKDK56551) is designed to fit the 2025-2026 Kia Carnival.
The CURT Custom Wiring Harness, 4-Way Flat, Select Kia Carnival without LED Taillights #56551 (Part #BKDK56551) fits the following vehicles: 2025-2026 Kia Carnival. Always verify your specific year, make, and model before ordering.
The CURT Custom Wiring Harness, 4-Way Flat, Select Kia Carnival without LED Taillights #56551 (Part #BKDK56551) fits 2025-2026 Kia Carnival 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, Select Kia Carnival without LED Taillights #56551 (Part #BKDK56551) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
The Curt 56551 is a powered converter module for trailer wiring on SUVs and vans. It converts the vehicle's lighting signals (left turn, right turn, brake, and taillight) into a 4-flat trailer connector. The module is mounted inside the vehicle and connects to the factory taillights and battery to provide power and signal to a trailer.
The Curt 56551 is designed for SUVs and vans with 12-volt negative ground electrical systems. Check your vehicle owner's manual to confirm it has a 12-volt negative ground system. The manual does not list specific vehicle makes or models, so contact Curt Manufacturing or your dealer to verify fitment for your exact vehicle.
No. The Curt 56551 is designed only for 12-volt negative ground systems. It cannot be used on positive ground vehicles. Check your vehicle owner's manual or contact the vehicle manufacturer to confirm your electrical system type.
You will need: ratchet, socket extension, 10mm socket, flathead screwdriver, wire cutter, wire stripper, wire crimper, utility knife, panel trim removal tool, and fishwire (or a substitute such as a cut-up wire hanger, stiff wire, rope or string). Proper tools will improve installation quality and reduce time required.
The manual confirms the following are provided: cable ties (for securing wires), 2-sided tape (for mounting the module), a ground screw, a 4-flat dust cover, and a fuse holder with 10-amp fuse. The manual does not itemize all included components, so check the product packaging for a complete parts list.
Yes. You must disconnect the negative battery terminal before beginning installation. Fasten this wire down and away from the battery while completing the installation. Reconnect it only after all other steps are complete and the fuse has been installed.
The installation is rated as Difficult. Installation difficulty is based on time and effort involved and may vary depending on installer expertise, vehicle condition, and availability of proper tools and equipment. The manual recommends reading all instructions thoroughly before beginning.
Locate the vehicle's battery in the engine compartment on the driver side and disconnect the negative battery terminal. Fasten this wire down and away from the battery while completing the installation.
Yes. You must remove both the driver side and passenger side taillights. Using a panel trim tool, remove the two caps covering the tail light fasteners on each side, then remove the two 10mm nuts holding each taillight in place. Pull the taillight outward from the side of the vehicle and separate the connector, taking care not to damage the locking tabs.
Fishwiring is a method to push or pull an electrical wire through a blind hole or cavity. Insert the fishwire (or substitute such as a wire hanger, stiff wire, rope or string) through the blind hole until it sticks out the other side. Use tape to secure the harness to the fishwire and pull it back up. If the wire gets hung up, you may need to push back down, wiggle it around, or twist it to loosen it. The manual provides detailed steps for routing the yellow wire (driver side) and green wire (passenger side) using this method.
The yellow wire (left turn signal) is routed from under the vehicle up to the driver side taillight opening using fishwire. The green wire (right turn signal) is routed to the bumper on the passenger side, then down between the body and bumper cover using fishwire, and attached to the factory harness. Secure all loose wires with the provided cable ties. Make sure all connectors are fully inserted with locking tabs in place.
Locate a mounting spot for the module inside the vehicle and secure it using the supplied 2-sided tape and/or zip ties. The manual does not specify an exact location, so choose a spot that is accessible for power connection and out of the way of vehicle occupants and moving parts.
When in use, route the 4-flat to the center of the vehicle and out of the trunk. When not in use, roll it up and store in a convenient, out-of-the-way location inside the trunk. Secure any loose wires with the provided cable ties. Install the provided 4-flat dust cover to help prevent corrosion.
Drilling may be required only for the ground wire 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, you may drill a 3/32" pilot hole. Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury. The area should be free from rust, dirt, and paint; use an abrasive pad or paper to clean it.
If you need to drill a grounding point for the white ground wire, drill a 3/32" pilot hole. Before drilling, ensure the area is free from rust, dirt, and paint by using an abrasive pad or paper. Always check for hidden items behind or under any surface before drilling to avoid damage and personal injury.
The manual does not provide a torque specification for the taillight fasteners. It specifies only that two 10mm nuts hold each taillight in place. Consult your vehicle owner's manual for the correct torque specification for taillight fasteners.
The wiring colors are: Yellow = Left turn signal, Green = Right turn signal, Red = Brake signal, Brown = Taillight (running lights), and White = Ground. These wires connect the vehicle's factory lighting circuits to the converter module, which outputs them through the 4-flat trailer connector.
The battery connection must be fuse-protected with a 10-amp maximum fuse. Do not exceed this rating. Exceeding the product rating can cause loss of warranty, overheating, and potential fire. Install the fuse after all other installation steps are complete.
Signal circuits (left and right turn): 3.0 amps per side. Tail/Running circuits: 6.0 amps total. Do not exceed these ratings or the product rating, whichever is lower. Exceeding the product rating can cause loss of warranty, overheating, and potential fire.
The power wire must be 12 gauge (12 GA) or larger. Route this wire from the vehicle battery location to the converter module, 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 grommet, or use silicone to protect it from sharp edges.
Route the 12 GA black power wire to the positive (+) battery terminal using a ring terminal connector. The battery connection must be fuse-protected with a 10-amp maximum fuse. Install the fuse after all other installation steps are complete. Secure the power wire to the vehicle chassis using the provided cable ties, and protect it from sharp edges when passing through sheet metal.
Attach the ring terminal of the white ground wire to the vehicle body using an existing screw or bolt in the frame, or using the provided ground screw. If drilling is necessary, drill a 3/32" pilot hole. The area should be free from rust, dirt, and paint; use an abrasive pad or paper to clean it before securing the ground wire.
Do not lay tools across the positive battery terminal, as this can cause a ground short leading to 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. Route the power wire away from 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 it from sharp edges. Do not exceed the product rating or tow vehicle lamp load rating, whichever is lower.
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. The manual also recommends testing for proper function before completing the installation. All steps must be followed to ensure the product will function properly.
Reinstall all items removed during installation in the reverse order of disassembly. If the negative battery terminal was disconnected at the beginning, reconnect it. Install the provided 4-flat dust cover to help prevent corrosion. Test the system with a test light, 4-flat tester, or functioning trailer to confirm proper operation.
Periodic inspection of all wires and connections should be performed to ensure there is no visible damage or loose connections. Check the 4-flat dust cover regularly to help prevent corrosion. No other maintenance intervals or procedures are specified in the manual.
The Curt 56551 is designed for SUVs and vans with 12-volt negative ground electrical systems. Verify your vehicle has a 12-volt negative ground system in your owner's manual. Contact Curt Manufacturing or your dealer to confirm fitment for your specific vehicle make and model.
Drilling may be required only for the ground wire connection if no existing frame fastener is available. If needed, drill a 3/32" pilot hole. Always check for hidden items before drilling to avoid damage.
The battery connection must be fuse-protected with a 10-amp maximum fuse. Do not exceed this rating, as it can cause loss of warranty, overheating, and potential fire.
The power wire must be 12 gauge (12 GA) or larger. Route it from the vehicle battery to the converter module, protecting it from sharp edges when passing through sheet metal.
Do not lay tools across the positive battery terminal, as this can cause a ground short leading to sparks and/or electrical shocks. Before drilling, check for hidden items to avoid damage and personal injury. Do not exceed the product rating or tow vehicle lamp load rating.
If the fishwire or harness gets hung up on something during routing, you may need to push back down, wiggle it around, or twist the wire to loosen it from what it is caught on. Ensure the wire is long enough to stick out on both sides of the blind hole before attempting to pull it through. If it remains stuck, carefully retrace the route and check for obstructions.
On Sale Today
Original price was $152.95. Current price is $120.99.You save $31.96 (21%)
Free Shipping
Ships free on all orders
Authorized Dealer
Quick Ship
In stock and ready to ship — order now!
Shipping from Lancaster, TXFREE SHIPPING
Estimated delivery Sun, Aug 16 - Tue, Aug 18
Order before 2 PM EST Monday–Friday for same-day processing
Guaranteed safe & secure checkout
No reviews have been added for this product.