15-21 Subaru WRX CURT 4-flat Plug and Play Trailer WiringCURTOriginal price was $107.90. Current price is $106.47.In Stock
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2022 - 2024 Subaru WRX
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| Side Application Type Description | Not Applicable |
| T-Connector Location | P1,P2 |
| Tail Light Circuits | 6.0 Amps |
| 29 | Pin |
| Turn and Brake Circuits | 3.0 Amps |
| Warranty | One-Year Limited Warranty |
| Converter Type | Circuit Protected, Powered, Potted |
| Electrical Component Location | Vehicle / Trailer |
| Electrical Package Type | Packaged |
| Electrical System Type | 3W |
| Material | THERMOPLASTIC RUBBER |
| Mount Type Description | Not Applicable |
| Output Type | 4-Way Flat |
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 |
|---|---|---|
| 2022 - 2024 | Subaru WRX | — |
The 22-24 Subaru WRX CURT 4-flat Plug and Play Trailer Wiring (Part #CTW2321) fits 2022-2024 Subaru WRX models. The 2024 model year is the last year covered by this part number. For newer models, check for an updated version.
The 22-24 Subaru WRX CURT 4-flat Plug and Play Trailer Wiring (Part #CTW2321) fits the following vehicles: 2022-2024 Subaru WRX. Always verify your specific year, make, and model before ordering.
Yes, the 22-24 Subaru WRX CURT 4-flat Plug and Play Trailer Wiring (Part #CTW2321) is designed to fit the 2022-2024 Subaru WRX.
The 22-24 Subaru WRX CURT 4-flat Plug and Play Trailer Wiring (Part #CTW2321) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
The Curt 56516 is a powered converter system that provides trailer lighting control for passenger cars. It converts the vehicle's taillight signals (left turn, right turn, brake, and running lights) into a 4-flat trailer connector. The system includes a converter module, wiring harness with yellow (left turn), green (right turn), red (brake), and brown (tail/running) wires, and a white ground wire.
The Curt 56516 is designed for passenger cars with 12-volt negative ground electrical systems. The manual does not specify compatible makes, models, or years. Consult the product fitment database or contact Curt Manufacturing to confirm compatibility with your specific vehicle.
No. The manual states 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.
Required tools are: panel removal tool, wire cutter, wire stripper, ratchet, 10mm socket, crimp tool, and Phillips screwdriver. Proper tools will improve installation quality and reduce installation time.
The manual shows a hardware photo and product photo but does not itemize all included components. Based on the instructions, the kit includes: yellow, green, red, and brown signal wires; white ground wire with ring terminal; black power wire; converter module; 4-flat dust cover; cable ties; ground screw; double-sided tape for converter mounting; and a fuse holder with 10-amp fuse. Refer to the product packaging or contact Curt Manufacturing for a complete parts list.
Yes. Step 1 requires you to locate the vehicle battery, look up its location in your vehicle owner's manual, and disconnect the negative battery terminal. Fasten this wire down and away from the battery during installation. Reconnect it only after all other steps are complete and before testing.
Yes. Step 2 and Step 3 require you to open the trunk, remove the taillight fastener trim cover with a Phillips screwdriver (one screw per side), and use a 10mm socket to remove two taillight fasteners per side. Pull the taillight straight back and separate the wiring connectors, taking care not to damage the locking tabs.
Use a fishwire (a stiff wire, cut-up wire hanger, rope, or string) to route the wires through blind holes in the vehicle body. Insert the fishwire through the hole and locate it on the other side. Tape the harness to the fishwire and pull back up. If the wire gets hung up, push back down, wiggle it, or twist it to loosen it. Starting on the driver side, attach the yellow wire to the fishwire and pull the harness up the body to attach to the factory wiring between the separated taillight connectors. Run the green wire along the back of the bumper to the passenger side, keeping clear of the exhaust, then repeat with the green wire routing to the passenger taillight cavity.
After routing the yellow wire up the driver side of the vehicle body using a fishwire, attach it to the factory wiring between the separated taillight connectors. Make sure the connectors are fully inserted with locking tabs in place. Repeat the same process with the green wire on the passenger side. Then reinstall the taillights on both sides, installing them in the taillight cavities.
Locate a grounding point such as an existing screw or bolt in the frame of the vehicle. The area should be free from rust, dirt, and paint; use an abrasive pad or paper to remove rust and paint if necessary. Secure the white ground wire with the ring terminal on the existing fastener. If no suitable fastener exists, drill a 3/32-inch pilot hole and use the provided ground screw. Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury.
Route the black power wire from the vehicle battery as shown on the Powered Converter Lead Instruction Sheet on page 5 of the manual. The black wire must be connected to the positive (+) battery terminal using a ring terminal. The connection must be fuse-protected with a 10-amp max fuse holder. Install the fuse only after all other steps are complete. Route the 12-gauge wire to the battery location, 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 the wire from sharp edges.
Mount the converter module using the provided double-sided tape. The exact mounting location is not specified in the manual; refer to the Powered Converter Lead Instruction Sheet diagram or contact Curt Manufacturing for the recommended location on your vehicle.
When in use, route the 4-flat connector with the center of the vehicle and out of the hatch to the trailer, staying clear of the hatch's latching mechanism. When not in use, roll up and store in a convenient, out-of-the-way location. Secure any loose wires with the provided cable ties. Install the provided 4-flat dust cover to help prevent corrosion.
The battery connection must be fuse-protected with a 10-amp maximum fuse. Exceeding this rating can cause loss of warranty, overheating, and potential fire. Install the fuse only after all other installation steps are complete.
If drilling a new ground hole is necessary, drill a 3/32-inch pilot hole. The white ground wire with ring terminal is then secured to the vehicle frame using either an existing fastener or the provided ground screw.
The power wire is 12-gauge (12 GA) or larger. This wire connects from the vehicle battery positive terminal to the converter module and must be routed through a fuse holder with a 10-amp maximum fuse.
Signal circuits (left turn and right turn): 3.0 amps per side. Tail/Running circuits: 6.0 amps total. Do not exceed the product rating or the tow vehicle lamp load rating, whichever is lower.
Yellow = Left turn signal. Green = Right turn signal. Red = Brake signal. Brown = Tail/Running lights. White = Ground. Black = Power (connects to positive battery terminal through fuse holder).
P1 is behind the driver side taillight housing, outside of trunk. P2 is behind the passenger side taillight housing, outside of trunk. These are the locations where the yellow and green signal wires connect to the factory taillight connectors.
Do not lay tools across the positive battery terminal (typically noted with red covers or a red '+' symbol), as this can cause a ground short resulting in sparks and/or electrical shocks. Always disconnect the negative battery terminal before beginning installation. Do not reconnect it until all other steps are complete. The battery connection must be fuse-protected with a 10-amp maximum fuse. Exceeding the product rating can cause loss of warranty, overheating, and potential fire.
Before drilling, check for miscellaneous items that may be hidden behind or under any surface to avoid damage and personal injury. The ground area should be free from rust, dirt, and paint; use an abrasive pad or paper to remove rust and paint. If drilling is necessary, drill a 3/32-inch pilot hole only after confirming there are no hidden 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. This prevents the wire insulation from being damaged and reduces the risk of electrical short circuits.
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 that all signal circuits (left turn, right turn, brake, and tail/running lights) are working correctly before using the system.
After testing the system with a test light or functioning trailer: reinstall all items removed during installation (taillight trim covers, taillights, trunk items); reconnect the negative battery terminal if it was disconnected; install the provided 4-flat dust cover to help prevent corrosion; and secure any loose wires with the provided cable ties.
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.
The Curt 56516 is designed for passenger cars with 12-volt negative ground electrical systems. Consult the product fitment database or contact Curt Manufacturing to confirm compatibility with your specific vehicle make, model, and year.
You will need: panel removal tool, wire cutter, wire stripper, ratchet, 10mm socket, crimp tool, and Phillips screwdriver.
Yes. Disconnect the negative battery terminal before beginning installation and reconnect it only after all other steps are complete and the system has been tested.
Drilling is required only if no suitable existing fastener or bolt is available for the ground wire. If necessary, drill a 3/32-inch pilot hole in the vehicle frame after checking for hidden items behind or under the surface.
The battery connection must use a 10-amp maximum fuse. Exceeding this rating can cause loss of warranty, overheating, and potential fire.
Yellow = Left turn, Green = Right turn, Red = Brake, Brown = Tail/Running lights, White = Ground, Black = Power (to battery positive terminal through fuse).
Do not lay tools across the positive battery terminal (risk of short circuit, sparks, and electrical shock). Always disconnect the negative battery terminal before installation. The connection must be fuse-protected with a 10-amp maximum fuse.
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