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Complete CURT Class 3 2" trailer hitch and 5-flat wiring kit (with 4-way to 5-way adapter for surge brakes) engineered for the 2025 - 2026 Kia Carnival, w/o LED Taillights. Vehicle-specific fit, plug-and-play installation, all hardware and instructions included.
This custom kit fits the following vehicles:
All Hardware and Installation Instructions Included!
Whatever your task at hand -- whether it's launching that boat before daybreak, setting up your camper before the rush or getting a final load to the dump before close -- CURT class 3 trailer hitches offer the strength needed for serious towing. They make it easy to hitch up and Bring It, offering a vehicle-specific fit and the weight capacity to handle a variety of trailers. Custom class 3 hitches are the most common type of receiver hitch for pickup trucks and SUVs. Because of their weight range, they are also found on full-size cars, crossovers and minivans. Each custom-fit class 3 hitch package is made for vehicle-specific mounting. This particular kit fits certain years of the Kia Carnival (see application info to verify vehicle compatibility). It provides a weight carrying capacity of 4,000 lbs. GTW and 665 lbs. TW. CURT class 3 trailer hitches are typically used to attach and haul utility trailers, boat trailers, campers, snowmobile or ATV haulers and more (NOTE: Never exceed the lowest-rated towing component). Each class 3 hitch has a 2" receiver tube and is tested in accordance with SAE J684 for safety. To ensure that CURT class 3 receiver hitches have what it takes for serious trailering, they are designed using a hands-on approach and are constructed with rugged, high-strength steel and precise welding. We also protect our class 3 hitches in a co-cured finish of liquid A-coat and black powder coat for superior resistance to rust, chipping and UV damage.
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 Kia Carnival without LED taillights (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 |
|---|---|---|
| 2025 - 2026 | Kia Carnival | w/o LED Taillights |
The CURT 13478 has a gross trailer weight (GTW) capacity of 4,000 lbs and a tongue weight (TW) capacity of 600 lbs. Never exceed your vehicle manufacturer's recommended towing capacity.
The manual does not specify which vehicle makes, models, years, cab styles or bed lengths the CURT 13478 is designed for. Contact CURT product support at 877.287.8634 or check curtmfg.com to confirm fitment for your specific vehicle before purchasing.
Required tools: paint marker, 6" socket extension, exhaust hanger removal tool, torque wrench, ratchet, tape measure, shears, trim panel pry tool, 3/4" socket, and 5/8" open-end wrench. A stand to support the exhaust is also required. For a full tools reference guide, visit curtmfg.com/trailer-hitch-installation.
The kit includes 6 hex bolts (M12-1.25 x 40mm, CL8.8) and 6 conical-toothed washers (1/2"). The vehicle must have existing weldnuts on both driver- and passenger-side frame rails.
Yes. In Step 1, remove the plastic cover on the driver side by removing six plastic clips. Set the cover and five clips aside for reinstallation later. Return one clip to the vehicle owner. The cover will be trimmed in Step 4 and reinstalled in Step 6.
Yes. In Step 2, lower the exhaust by removing the two rearmost rubber isolators from the exhaust hanger rods. Use a stand to support the exhaust and prevent damage. The exhaust will be reinstalled in Step 6 after the hitch is mounted.
Use an exhaust hanger removal tool if available. If not, use a 5/8" open-end wrench: slide it up to the rubber isolator, cradling the hanger rod. Place the flat edge of a pry bar between the wrench and the hanger stop or rod, then rotate the pry bar toward the wrench to remove the isolator. Using lubricant or soapy water on the hanger rod and isolator helps removal.
Spray lubricant or compressed air into the weldnut holes to remove debris. For heavy debris, use a wire brush. Take care not to damage the threads.
1. Remove the plastic cover and six plastic clips (Step 1). 2. Lower the exhaust by removing two rubber isolators and support with a stand (Step 2). 3. Raise the hitch into position, sliding the passenger side over the exhaust first, and align three holes on each side with weldnuts (Step 3). 4. Trim the plastic cover to dimensions shown (Step 4). 5. Inspect hitch and bumper fascia clearance; trim bumper fascia if needed (Step 5). 6. Reinstall the plastic cover and exhaust (Step 6).
In Step 3, raise the hitch into position by sliding the passenger side of the hitch over the exhaust first. Align the three holes in the hitch with the three weldnuts in the bottom of both driver- and passenger-side frame rails. Loosely install three hex bolts and three conical washers on each side before torquing.
Torque all M12 fasteners to 60 ft-lbs. Install the bolts and washers loosely first, then torque to specification after alignment.
The hex bolts are M12-1.25 x 40mm, Class 8.8. Six bolts are included, three for each side of the hitch.
The conical-toothed washers are 1/2" in size. Six washers are included, three for each side of the hitch.
The conical-toothed washer should be placed between the hex bolt and the hitch side plate, with the toothed side facing the hitch to grip and prevent loosening.
No drilling is required. The hitch aligns with three existing weldnuts on each side of the vehicle frame rails. However, the plastic cover must be trimmed to dimensions shown in Step 4, and the bumper fascia tab may need trimming for clearance in Step 5.
Trim the plastic cover to the following dimensions: 10-3/8" width, 6-3/4" height, 4" depth, and 1-3/4" at the bottom section. Use shears to cut the cover as shown in Step 4.
Trim the bumper fascia tab only if needed for clearance. In Step 5, inspect the hitch and the bumper fascia tab on the passenger side near the exhaust. If additional clearance is needed between the hitch and bumper fascia tab, trim the fascia tab as needed.
Wear safety glasses at all times during installation. Use a stand to support the exhaust when it is lowered to prevent damage. Never exceed your vehicle manufacturer's recommended towing capacity when using the hitch.
Never exceed your vehicle manufacturer's recommended towing capacity. The CURT 13478 is rated for 4,000 lbs GTW and 600 lbs tongue weight, but your vehicle's capacity may be lower.
In Step 5, inspect the hitch and the bumper fascia tab on the passenger side near the exhaust to ensure adequate clearance. Trim the bumper fascia tab if needed. After installation, perform periodic inspections to ensure all mounting hardware remains tight and structural components are secure.
Periodic inspection of the trailer hitch should be performed to ensure all mounting hardware remains tight and structural components are secure. The manual does not specify the exact interval; consult your vehicle owner's manual or contact CURT product support at 877.287.8634 for recommended inspection frequency.
The manual specifies that all M12 fasteners should be torqued to 60 ft-lbs during installation and that periodic inspection should ensure all mounting hardware remains tight. However, the manual does not specify a retorque interval. Contact CURT product support at 877.287.8634 for retorque recommendations.
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.
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