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2019 - 2023 Lincoln Nautilus
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| Battery-Powered | Yes |
| Converter Type | Universal, Potted, Powered, Protected, PWM |
| Electrical System Type | PWM-STT |
| Finish | N/A |
| Material | Blank |
| Mount Type Description | Blank |
| Output Type | 4-Way Flat |
| Side Application Type Description | Blank |
| T-Connector Location | S1,S2 |
| Tail Light Circuits | 3.0 Amps |
| Turn and Brake Circuits | 6.0 Amps |
| Warranty | One-Year Limited Warranty |
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 |
|---|---|---|
| 2019 - 2023 | Lincoln Nautilus | — |
Yes, the 19-23 Lincoln Nautilus CURT 4-flat Plug and Play Trailer Wiring (Part #CTW1750) is designed to fit the 2019-2023 Lincoln Nautilus.
The 19-23 Lincoln Nautilus CURT 4-flat Plug and Play Trailer Wiring (Part #CTW1750) fits the following vehicles: 2019-2023 Lincoln Nautilus. Always verify your specific year, make, and model before ordering.
The 19-23 Lincoln Nautilus CURT 4-flat Plug and Play Trailer Wiring (Part #CTW1750) fits 2019-2023 Lincoln Nautilus models. The 2023 model year is the last year covered by this part number. For newer models, check for an updated version.
The 19-23 Lincoln Nautilus CURT 4-flat Plug and Play Trailer Wiring (Part #CTW1750) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
The Curt 56446 is a custom wiring harness with a powered converter system designed for SUVs and vans. It provides signal circuits (6.0 amps per side) and tail/running circuits (3.0 amps total) to connect your vehicle's lighting system to a trailer. The system includes a converter box that converts the vehicle's factory taillight signals for use with a 4-flat trailer connector.
The Curt 56446 is designed for SUVs and vans. The system is compatible only with 12 volt negative ground systems. For specific vehicle model and year compatibility, contact Curt Manufacturing or consult your vehicle's owner's manual to confirm your vehicle has a 12 volt negative ground electrical system.
Required tools are: ratchet, T-20 Torx bit, socket extension, cutting tool, fishwire (or stiff wire, rope or string), wire crimper, electrical tape, wire stripper, and flathead screwdriver. Proper tools will improve installation quality and reduce installation time.
The manual shows a hardware photo but does not itemize individual components. The product includes: a converter box, a 4-flat connector, double-sided tape for mounting the converter, a white ground wire with ring terminal, a black power wire, cable ties, a 4-flat dust cover, and a screw for ground wire installation. Refer to the product packaging or contact Curt Manufacturing for a complete parts list.
Yes. Step 1 requires you to 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. The battery must remain disconnected until Step 7, when you reconnect it after all other wiring is complete and before testing.
Open the rear hatch. Using a small screwdriver, remove the fastener cover. Using a T-20 Torx bit, remove the fastener holding the taillight. Remove the taillight by pulling it straight rearward and then outward to the side of the vehicle. Locate the vehicle taillight wiring connectors and separate them from the taillight housing, taking care not to damage the locking tabs. Repeat on the other side of the vehicle.
Fishwiring is a method to push or pull an electrical wire through a blind hole. Insert a stiff wire, rope, string, or cut-up wire hanger (the 'fishwire') through the blind hole and locate it on the other side. Use tape to secure the harness to the fishwire and pull back up. If the fishwire gets hung up, you may need to push back down, wiggle it around, or twist the wire to loosen it. Make sure the fishwire is long enough to stick out on the other side before starting.
On the driver side, route the fishwire down between the body and the bumper cover. From under the vehicle, locate and attach the fishwire to the housing with the yellow wire. Pull the wire back up and attach to the factory harness. Make sure the connectors are fully inserted with locking tabs in place.
Route the green wire along the backside of the bumper cover. Use cable ties to secure any loose wire as needed.
On the passenger side, route the fishwire down between the body and the bumper cover. From under the vehicle, locate and attach the fishwire to the housing with the yellow wire. Pull the wire back up and attach to the factory harness. Make sure the connectors are fully inserted with locking tabs in place.
Locate a flat spot inside the vehicle near the yellow wire and adhere the black converter box using the provided double-sided tape. The area should be clean and suitable for tape adhesion.
Not necessarily. Locate a suitable grounding point near the converter box connector, such as an existing screw with nut in the vehicle frame. If no suitable existing screw is available, drill a 3/32" pilot hole for the provided screw. The area should be free of rust, dirt and paint. Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury.
Drill a 3/32" pilot hole for the provided ground wire screw. The area should be free of rust, dirt and paint. Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury.
Secure the white ground wire using the ring terminal and the provided screw. Attach the ring terminal to a suitable grounding point near the converter box connector, such as an existing screw with nut in the vehicle frame, or drill a 3/32" pilot hole if necessary. The area should be free of rust, dirt and paint.
Use 12 GA (12 gauge) wire or larger to route from the vehicle battery to the converter system. Route the 12 GA wire to the vehicle battery location, taking care to avoid any pinch points and hot or rotating components.
The black power wire connects to the positive (+) battery terminal. Route the black power wire from the vehicle battery as shown on the provided Powered Converter Lead Instruction Sheet. Use a ring terminal for the battery connection.
The wire colors and their functions are: Green = Right turn, Red = Brake, Yellow = Left turn, Brown = Taillight. These wires connect the factory taillight signals to the converter system for trailer lighting control.
The signal circuits are rated for 6.0 amps per side. Do not exceed this 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 tail and running circuits are rated for 3.0 amps total. Do not exceed this 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 15-amp maximum fuse. Install the fuse after all other steps are complete. Exceeding the product rating can cause loss of warranty, overheating and potential fire.
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. This prevents damage to the wire insulation and potential electrical hazards.
Use the provided cable ties to secure any loose wire as needed. Secure the power wire to the vehicle chassis using cable ties provided. This prevents wires from moving, rubbing, or becoming pinched during vehicle operation.
Route the 4-flat to the trailer hitch and mount in an easy-to-access location. Install the provided 4-flat dust cover to help prevent corrosion.
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. This confirms all connections are correct and the system is operating properly before final reassembly.
Periodic inspection of all wires and connections should be performed to ensure there is no visible damage or loose connections. This helps maintain proper function and prevents electrical failures.
No. The 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.
Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury. This includes checking for fuel lines, brake lines, electrical wiring, and other components that could be damaged by drilling.
After disconnecting the negative battery terminal, fasten this wire down and away from the battery while completing the installation process. This prevents accidental reconnection and electrical hazards during installation.
After completing all wiring steps and testing the system with a test light, 4-flat tester, or functioning trailer, reinstall all items removed during installation. If the negative battery terminal was disconnected at the beginning, reconnect it. Install the provided 4-flat dust cover to help prevent corrosion.
The Curt 56446 is designed for SUVs and vans with 12 volt negative ground electrical systems. Confirm your vehicle meets these requirements before purchasing.
Yes, you must disconnect the negative battery terminal before beginning installation and keep it disconnected until after all wiring is complete and tested.
Drilling is only required if no suitable existing screw is available for the ground wire. If needed, drill a 3/32" pilot hole. Always check for hidden items before drilling.
Use a 15-amp maximum fuse for the battery connection. Install the fuse after all other steps are complete.
Use 12 GA (12 gauge) wire or larger for the power wire from the battery to the converter system.
Periodically inspect all wires and connections to ensure there is no visible damage or loose connections.
If the fishwire gets hung up on something during routing, you may have to push back down, wiggle it around, or twist the wire to loosen it from what it's hung up on. Ensure the fishwire is long enough to stick out on the other side before starting, and use tape to secure the harness to the fishwire before pulling.
When removing the taillight connectors, take care not to damage the locking tabs. If connectors are difficult to separate, gently wiggle them while pulling to avoid breaking the tabs. Ensure the connectors are fully inserted with locking tabs in place when reconnecting to the factory harness.
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