Our in-house experts typically reply within one business day.
CURT
Verify Fitment
Select your vehicle to confirm this part fits.
2022 - 2024 BMW X3
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!
Fuse holder
Battery connection wiring
Necessary wiring components
Dust cover
| Warranty | One-Year Limited Warranty |
| Connector Type | Male |
| Terminal Type | Female |
| Terminal Style | Pin |
| System Type | 2-wire |
| Package Type | Packaged |
| Converter Style | Universal, Potted, Powered, Protected, PWM |
| Component Location | Vehicle / Trailer |
| Battery Required | Yes |
| Turn/Brake Circuit Capacity | 5.0 Amps |
| Tail Light Circuit Capacity | 7.5 Amps |
| Warranty | One-Year Limited Warranty |
| T-Connector Position | S3, S4 |
| Material Type | Thermoplastic Rubber |
| Vehicle Compatibility | BMW X3 (specific years) |
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 BMW X3 (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 |
|---|---|---|
| 2022 - 2024 | BMW X3 | — |
The CURT Custom Wiring Harness, 4-Way Flat Output, Select BMW X3 56543 (Part #BKDK56543) fits 2022-2024 BMW X3 models. The 2024 model year is the last year covered by this part number. For newer models, check for an updated version.
Yes, the CURT Custom Wiring Harness, 4-Way Flat Output, Select BMW X3 56543 (Part #BKDK56543) is designed to fit the 2022-2024 BMW X3.
The CURT Custom Wiring Harness, 4-Way Flat Output, Select BMW X3 56543 (Part #BKDK56543) fits the following vehicles: 2022-2024 BMW X3. Always verify your specific year, make, and model before ordering.
The CURT Custom Wiring Harness, 4-Way Flat Output, Select BMW X3 56543 (Part #BKDK56543) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
The Curt 56543 is a powered converter system designed for SUVs and vans. It converts 12-volt vehicle power to a 4-flat trailer connector, allowing you to tow a trailer with integrated lighting. The converter manages signal circuits (5.0 amps per side) and tail/running circuits (7.5 amps total) from your vehicle's electrical system.
The Curt 56543 is designed for SUVs and vans with 12-volt negative ground electrical systems. The manual does not specify which vehicle makes, models, or years are compatible. Contact Curt Manufacturing or consult a fitment database to confirm compatibility with your specific vehicle.
No. The Curt 56543 converter system is designed only for 12-volt negative ground systems. It cannot be used on positive ground vehicles. Check your vehicle owner's manual to confirm your electrical system type.
Required tools are: ratchet, ratchet extension, 10mm socket, wire cutter, wire stripper, wire crimper, flathead screwdriver, panel trim removal tool, and utility knife. Proper tools will improve installation quality and reduce time required.
The kit includes: a black converter box, a custom harness with yellow wire housing, a green wire, a white ground wire with ring terminal, a black power wire, a ground screw, double-sided tape for mounting the converter, cable ties for securing wires, a 4-flat dust cover, and a fuse holder with 15-amp fuse. The fuse should be installed only after all other installation steps are complete.
Yes. You must disconnect the negative battery terminal before beginning installation. Open the rear hatch, remove the spare tire access cover, use a flathead screwdriver to turn the two fasteners on the plastic trim panel, and disconnect the negative terminal. Fasten this wire down and away from the battery while completing installation. Reconnect it only after all other steps are complete and the fuse is installed.
The manual rates this installation as 'Difficult' based on time and effort involved. Difficulty may vary depending on installer expertise, vehicle condition, and proper tools and equipment. The manual does not explicitly require professional installation, but the difficulty level and electrical work involved suggest that professional installation is recommended for most users.
1. Remove the driver-side and passenger-side rear access panels. 2. Using a 10mm socket, remove the nuts securing the taillight from inside the access panel. 3. Remove the taillight straight back and separate the wiring connectors carefully, taking care not to damage the locking tabs. 4. Set the taillight aside and repeat on the other side. The manual also mentions removing a taillight fastener from the trim cover using a panel trim tool, and removing two 10mm nuts securing the taillight on each side.
Locate the factory wiring in the driver-side taillight cavity. Route the custom harness connector (with yellow wire housing) to the taillight cavity and attach it to the taillight. Route the converter box to the bottom of the access panel. Then route the green wire under the hatch opening trim and threshold, past the battery compartment, and into the passenger-side taillight access panel. Install the green wire's housing between the factory taillight connector and taillight.
Locate a flat, clean surface in the taillight cavity. Adhere the black converter box using the provided double-sided tape. The box must be mounted in a protected area. Failure to mount it in a protected area can cause loss of warranty, product failure, overheating, and potential fire.
You should first locate an existing screw or bolt in the vehicle frame to use as a grounding point. If no suitable existing fastener is available, you may drill a 3/32" pilot hole. Before drilling, the area must be free from rust, dirt, and paint—use an abrasive pad or paper to clean it. Always check for miscellaneous items hidden behind or under any surface before drilling to avoid damage and personal injury.
If an existing fastener is not available, drill a 3/32" pilot hole for the ground screw. The area must be free from rust, dirt, and paint. Always check for hidden items behind or under the surface before drilling to avoid damage and personal injury.
Use 12 GA (12-gauge) wire or larger for the power wire. Route it from the vehicle battery location, 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 wire from sharp edges. Secure the power wire to the vehicle chassis using the provided cable ties.
The maximum fuse rating is 15 amps. The battery connection must be fuse-protected with a 15-amp max fuse. Exceeding the product rating can cause loss of warranty, overheating, and potential fire. Install the fuse only after all other installation steps are complete.
Signal circuits: 5.0 amps per side. Tail/Running circuits: 7.5 amps total. Do not exceed the product rating or the tow vehicle lamp load rating, whichever is lower.
Route the 12 GA black power wire to the positive (+) battery terminal using a ring terminal connector. The ring terminal must be used for the battery connection. Do not lay tools across the positive battery terminal (typically marked with red covers or a red '+' symbol), as this can cause a ground short resulting in sparks and electrical shock. Install the fuse holder with 15-amp fuse only after all other steps are complete.
Attach the ring terminal of the white ground wire to the vehicle body using an existing screw or bolt in the frame, or the provided ground screw. If drilling is necessary, drill a 3/32" pilot hole in an area free from rust, dirt, and paint. Use an abrasive pad or paper to clean the area before securing the wire.
Do not lay tools across the positive battery terminal (marked with red covers or '+' symbol), as this can cause a short, sparks, and electrical shock. Check for miscellaneous items hidden behind or under any surface before drilling 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. Mount the converter box in a protected area to prevent warranty loss, product failure, overheating, and fire. Do not exceed the product rating or tow vehicle lamp load rating.
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. All steps must be followed to ensure the product functions properly.
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. Route the 4-flat connector to the center of the vehicle and out of the hatch. When not in use, roll up and store the connector in the cargo area. When in use, roll it out between the hatch door and the vehicle, staying clear of the hatch lock mechanism. 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. The manual does not specify an inspection interval. Check your vehicle owner's manual or contact the vehicle manufacturer for additional maintenance information.
The 4-flat connector is the trailer connector outlet. When in use, route it to the center of the vehicle and out of the hatch. When not in use, roll it up and store it in the cargo area. When towing, roll it out between the hatch door and the vehicle, being sure to stay clear of the hatch lock mechanism. Install the provided 4-flat dust cover to help prevent corrosion when not in use.
Yes, the Curt 56543 is designed for SUVs and vans with 12-volt negative ground electrical systems. Confirm your vehicle's electrical system type in your owner's manual before purchasing.
You will need: ratchet, ratchet extension, 10mm socket, wire cutter, wire stripper, wire crimper, flathead screwdriver, panel trim removal tool, and utility knife.
Yes, you must disconnect the negative battery terminal before installation and reconnect it only after all other steps are complete and the fuse is installed.
Drilling is optional. You should first locate an existing screw or bolt in the vehicle frame for the ground wire. If none is available, you may drill a 3/32" pilot hole. Always check for hidden items before drilling.
Use 12 GA (12-gauge) wire or larger for the power wire from the battery.
The installation is rated as 'Difficult' based on time and effort involved. Difficulty may vary depending on installer expertise, vehicle condition, and proper tools and equipment.
Verify that the harness is functioning by testing with a test light, 4-flat tester, or a functioning trailer. Ensure the 12-volt power wire is properly connected to the battery with a ring terminal. Check that the fuse is installed and rated at 15 amps maximum. Verify that all wiring connectors are properly seated and not damaged. Confirm that the negative battery terminal is reconnected. Check that the converter box is properly mounted and all wires are secure.
The converter may be overheating if it is not mounted in a protected area, if the fuse rating exceeds 15 amps, or if the product rating is exceeded. Ensure the converter box is mounted in a protected, flat, clean surface in the taillight cavity using the provided double-sided tape. Verify the fuse is rated at 15 amps maximum. Do not exceed the product rating or the tow vehicle lamp load rating. Failure to mount the box in a protected area can cause loss of warranty, product failure, overheating, and potential fire.
Do not lay tools across the positive battery terminal (marked with red covers or '+' symbol), as this can cause a ground short resulting in sparks and electrical shock. Ensure no tools are touching the positive terminal. Verify that the fuse is rated at 15 amps maximum and that the product rating is not exceeded. Check that all wiring connections are secure and properly insulated. If sparks or burning smell persists, disconnect the battery immediately and do not proceed with installation.
When removing the taillights, remove them straight back and separate the wiring connectors carefully, taking care not to damage the locking tabs. If the locking tabs are already damaged, the connectors may need to be replaced. Consult the vehicle manufacturer for replacement connector availability.
On Sale Today
Original price was $163.95. Current price is $128.99.You save $34.96 (21%)
Free Shipping
Ships free on all orders
Authorized Dealer
Quick Ship
In stock and ready to ship — order now!
Shipping from Eau Claire, WIFREE SHIPPING
Estimated delivery Thu, Sep 17 - Sat, Sep 19
Order before 2 PM EST Monday–Friday for same-day processing
Guaranteed safe & secure checkout
No reviews have been added for this product.