Our in-house experts typically reply within one business day.
CURT
Verify Fitment
Select your vehicle to confirm this part fits.
Always the correct part
We know our products
Quality Products
Free Shipping!
Always the correct part
We know our products
Quality Products
Free Shipping!
| Turn and Brake Circuits | 3.0 Amps |
| Warranty | One-Year Limited Warranty |
| Battery-Powered | Yes |
| Converter Type | Circuit Protected, Powered |
| Electrical System Type | 3W |
| Finish | N/A |
| Material | Blank |
| Mount Type Description | Blank |
| Output Type | 4-Way Flat |
| Side Application Type Description | Blank |
| T-Connector Location | P3,P5,P7 |
| Tail Light Circuits | 6.0 Amps |
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 888-634-94941 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2018 - 2021 | Hyundai Kona | N Line |
The 18-21 Hyundai Kona N Line CURT 4-flat Plug and Play Trailer Wiring (Part #CTW1426) fits the following vehicles: 2018-2021 Hyundai Kona. Always verify your specific year, make, and model before ordering.
Yes, the 18-21 Hyundai Kona N Line CURT 4-flat Plug and Play Trailer Wiring (Part #CTW1426) is designed to fit the 2018-2021 Hyundai Kona.
The 18-21 Hyundai Kona N Line CURT 4-flat Plug and Play Trailer Wiring (Part #CTW1426) fits 2018-2021 Hyundai Kona models. The 2021 model year is the last year covered by this part number. For newer models, check for an updated version.
The 18-21 Hyundai Kona N Line CURT 4-flat Plug and Play Trailer Wiring (Part #CTW1426) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
CURT 56409 is a custom wiring harness with a powered converter system designed for passenger cars. It provides signal circuits (3.0 amps per side) and tail/running circuits (6.0 amps total) to enable trailer lighting or other auxiliary lighting functions. The system includes a black converter box that mounts inside the vehicle near the taillight, a power lead that connects to the vehicle battery, and wiring harnesses that connect to the vehicle's existing taillight connectors.
CURT 56409 is designed for passenger cars with 12-volt negative ground electrical systems. The manual shows wiring locations for passenger cars (P1–P7) and notes that battery location may differ depending on the vehicle. You should verify compatibility with your specific vehicle model before purchase. Consult the vehicle owner's manual or contact the vehicle manufacturer for confirmation.
No. The manual explicitly states that this converter system is to be used only on 12-volt negative ground systems. It is not compatible with 24-volt systems or positive ground systems.
The following tools are required: ratchet, ratchet extension, socket (1/4"), Phillips screwdriver, side cutter, wire crimper, wire stripper, panel trim removal tool, and utility knife. Proper tools will improve the quality of installation and reduce the time required.
The kit includes: a black converter box, a 12-gauge power wire with ring terminal for battery connection, a white ground wire with ring terminal, a provided screw for grounding, cable ties for securing wires, provided double-sided tape for mounting the converter box, a grommet sealant, a 4-flat dust cover, and a fuse holder with 10-amp fuse (to be installed after all other steps are complete). The kit also includes wiring harnesses with red, yellow, green, and brown wires for connection to vehicle taillight connectors.
Yes. The manual explicitly states: "Disconnect negative battery (-) cable before wiring the power wire." This is a required safety step before beginning the power wire installation. After all other installation steps are complete and the fuse is installed, you may reconnect the negative battery terminal.
The manual rates the installation difficulty as "Easy." However, the installation involves multiple steps including removing trim panels, accessing taillight connectors, routing wires through the vehicle, drilling a pilot hole for grounding, and making electrical connections. You should read all instructions thoroughly before beginning.
The installation follows these main steps: (1) Open trunk and remove floor coverings; (2) Remove rear scuff panel; (3) Remove driver-side trim panel fasteners and locate taillight connectors; (4) Insert custom wiring with red wire between separated connectors; (5) Remove grommet from taillight wiring harness; (6) Cut slit in grommet and route yellow and green wires through; (7) Locate and separate passenger-side taillight turn signal connector and insert yellow wire; (8) Repeat steps 5–7 on passenger side with green wire; (9) Locate grounding point and secure white ground wire; (10) Mount converter box and route power wire from battery. All steps must be followed to ensure proper function.
Locate the vehicle's taillight wiring connectors behind the taillight housing. The connectors will be similar to those on the custom wiring product. Carefully separate the connectors without damaging the locking tabs. Insert the custom wiring end (with the appropriate wire colour: red for brake, yellow for left turn, green for right turn) between the separated connectors. Make sure the connectors are fully inserted with locking tabs in place. Repeat this process for both driver and passenger sides.
Route the custom wiring end with yellow and green wires out through the grommet opening and through a slit cut in the grommet from the trunk to the taillight connector. Remove the grommet from which the vehicle taillight wiring harness passes through from inside the trunk to underneath the vehicle. Cut a slit large enough to route the new custom wiring through. After routing, reseat the grommet and use the provided sealant to seal the cut in the grommet and around all wires. Secure any loose wires with the provided cable ties.
Locate a flat spot inside the vehicle near the taillight. Adhere the black converter box using the provided double-sided tape. The converter should be mounted in a location that is convenient and out of the way, as the 4-flat connector should be rolled up and stored inside the trunk when not in use.
Drilling may be required for the ground wire connection. You must locate a suitable grounding point near the connector, such as an existing screw with nut in the vehicle frame. If no suitable existing point is available, you will need to drill a 3/32" pilot hole for the provided screw. 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 of rust, dirt and paint.
Yes. You must remove the grommet from which the vehicle taillight wiring harness passes through from inside the trunk to underneath the vehicle, and cut a slit large enough to route the new custom wiring end through. After routing the wires, reseat the grommet and use the provided sealant to seal the cut in the grommet and around all wires.
The battery connection must be fuse-protected with a 10-amp maximum fuse. The manual states: "The battery connection must be fuse-protected, 10-amp max. Exceeding the product rating can cause loss of warranty, overheating and potential fire." The fuse holder with 10-amp fuse is provided and should be installed after all other steps are complete.
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.
If a suitable existing grounding point is not available, drill a 3/32" pilot hole for the provided screw. The area should be free of rust, dirt and paint before securing the white ground wire using the ring terminal and provided screw.
The wiring harness uses the following colours: Red = Brake, Yellow = Left turn, Green = Right turn, Brown = Taillight. The converter also includes a white ground wire and a black power wire. Each wire must be connected to the correct vehicle connector to ensure proper function.
Route the 12-gauge black power wire from the vehicle battery to the converter, 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. Attach the ring terminal of the power wire to the positive (+) battery terminal. Install the provided fuse holder with 10-amp fuse after all other steps are complete. The negative battery cable must be disconnected before wiring the power wire and reconnected after installation is complete.
Locate a suitable grounding point on the driver side behind the side wall panel near the connector, such as an existing screw with nut in the vehicle frame. If no suitable point exists, drill a 3/32" pilot hole for the provided screw. The area should be free of rust, dirt and paint. Secure the white ground wire using the ring terminal and provided screw. Alternatively, attach the ring terminal of the white ground wire to the vehicle body using the screw provided (drill a 3/32" hole if necessary).
Key safety warnings: (1) Do not exceed product rating or tow vehicle lamp load rating, whichever is lower. Exceeding the product rating can cause loss of warranty, overheating and potential fire. (2) The battery connection must be fuse-protected, 10-amp max. (3) Check for miscellaneous items that may be hidden behind or under any surface before drilling to avoid damage and personal injury. (4) Route the power wire to avoid pinch points and hot or rotating components. (5) Disconnect the negative battery cable before wiring the power wire. (6) Use a ring terminal for battery connection. (7) When passing the power wire through sheet metal, use an existing grommet, add a grommet, or use silicone to protect from sharp edges.
After installation: (1) Reinstall all items removed during installation. (2) Reconnect the negative battery terminal if it was disconnected. (3) Install the provided 4-flat dust cover to help prevent corrosion. (4) Test for proper function by using a test light or connecting a properly wired trailer. (5) Ensure all wires are secured with cable ties and the grommet is sealed with the provided sealant.
Periodic inspection of all wires and connections should be performed to ensure there is no visible damage or loose connections. Check the fuse periodically to ensure it has not blown. If the system stops functioning, verify that the fuse is intact and that all connections remain tight and free of corrosion.
The manual states that when in use, the 4-flat should be routed to the center of the vehicle and out of the trunk. When not in use, it should be rolled up and stored in a convenient, out-of-the-way location inside the trunk. A 4-flat dust cover is provided to help prevent corrosion. However, the manual does not specify the exact function or what the 4-flat connector connects to.
CURT 56409 is designed for passenger cars with 12-volt negative ground electrical systems. Verify your vehicle's electrical system type and consult the vehicle owner's manual or contact the vehicle manufacturer to confirm compatibility with your specific model.
Required tools: ratchet, ratchet extension, 1/4" socket, Phillips screwdriver, side cutter, wire crimper, wire stripper, panel trim removal tool, and utility knife.
Yes. Disconnect the negative battery cable before wiring the power wire. Reconnect it after all other installation steps are complete and the fuse is installed.
Red = Brake, Yellow = Left turn, Green = Right turn, Brown = Taillight, White = Ground, Black = Power.
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. The battery connection must be fuse-protected with a 10-amp maximum fuse.
Test for proper function by using a test light or connecting a properly wired trailer. Ensure all wires are secured and the grommet is sealed. Reinstall all removed items and reconnect the negative battery terminal.
Perform the following checks: (1) Verify that the 10-amp fuse is intact and properly installed in the fuse holder. (2) Inspect all wire connections to ensure they are fully inserted with locking tabs in place. (3) Check that the negative battery terminal is reconnected. (4) Perform periodic inspection of all wires and connections to ensure there is no visible damage or loose connections. (5) Test for proper function using a test light or a properly wired trailer. If the system still does not function, consult the vehicle manufacturer or a qualified technician.
On Sale Today
Original price was $138.90. Current price is $128.76.You save $10.14 (7%)
Free Shipping
Ships free on all orders
Authorized Dealer
Quick Ship
In stock and ready to ship — order now!
FREE ShippingFREE SHIPPING
Estimated delivery Sat, Aug 15 - Tue, Aug 18
Order before 2 PM EST Monday–Friday for same-day processing
Guaranteed safe & secure checkout
Total for 4 items:
$204.71$214.85
No reviews have been added for this product.