CURT Custom Wiring Harness, 4-Way Flat Output, Select BMW X3 56543CURTOriginal price was $163.95. Current price is $128.99.In Stock
View productAsk a Question About This Product
Our in-house experts typically reply within one business day.
Our in-house experts typically reply within one business day.
CURT
Always the correct part
We know our products
Quality Products
Free Shipping!
Verify Fitment
Select your vehicle to confirm this part fits.
Fuse holder
Battery connection wiring
Necessary wiring components
Dust cover
| Warranty | One-Year Limited Warranty |
| Connector Type | Male Female |
| Terminal Style | Pin |
| Electrical System | 2-wire |
| Package Type | Packaged |
| Converter Style | Universal, Potted, Powered, Protected, PWM |
| Battery Required | Yes |
| Tail Light Circuit Capacity | 5.0 Amps |
| Turn/Brake Circuit Capacity | 7.5 Amps |
| Warranty | One-Year Limited Warranty |
| T-Connector Position | S1, S2 |
| Material | Thermoplastic Rubber |
| Vehicle Compatibility | BMW X5 (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 X5 (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 |
|---|---|---|
| 2015 - 2018 | BMW X5 | Installation Time: 30-60 minutes |
The CURT Custom Wiring Harness, 4-Way Flat Output, Select BMW X5 56534 (Part #BKDK56534) fits the following vehicles: 2015-2018 BMW X5. Always verify your specific year, make, and model before ordering.
The CURT Custom Wiring Harness, 4-Way Flat Output, Select BMW X5 56534 (Part #BKDK56534) fits 2015-2018 BMW X5 models. The 2018 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 X5 56534 (Part #BKDK56534) is designed to fit the 2015-2018 BMW X5.
The CURT Custom Wiring Harness, 4-Way Flat Output, Select BMW X5 56534 (Part #BKDK56534) Typical installation time is 30-60 minutes. Basic hand tools are typically all you need.
Part number 56534 is designed for SUVs and Vans (S). The manual does not list specific vehicle models or years. Contact Curt Manufacturing or consult a fitment database to confirm compatibility with your vehicle.
Part 56534 is a powered converter wiring system for SUVs and Vans. It converts vehicle taillight signals to trailer lighting signals and includes a converter box, wiring harness with yellow, green, white, and black wires, a 4-flat connector, double-sided tape, cable ties, a ground screw, and a 4-flat dust cover.
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.
Yes. Step 1 requires you to locate the vehicle's battery on the passenger side of the trunk compartment 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 8, when you reconnect it after all other wiring is complete.
Wire cutter, wire stripper, wire crimper, ratchet, 10mm socket, 8mm socket, utility knife, and panel trim removal tool.
The kit includes a black converter box, wiring harness with yellow, green, white, and black wires, a 4-flat connector, double-sided tape for mounting the converter, cable ties for securing loose wires, a ground screw with ring terminal, and a 4-flat dust cover.
Drilling may be required. Step 7 instructs you to locate an existing screw or bolt in the vehicle frame for the ground wire, or drill a 3/32" pilot hole if no existing fastener is available. Before drilling, check for hidden items behind or under any surface to avoid damage and personal injury.
A 3/32" pilot hole is required if you cannot use an existing screw or bolt in the vehicle frame. The area must be free from rust, dirt, and paint; use an abrasive pad or paper to clean it before drilling.
Yellow = Left turn signal; Green = Right turn signal; Red = Brake signal; Brown = Taillight. The converter also includes a black power wire (connects to positive battery terminal) and a white ground wire (connects to vehicle frame).
The yellow wire is the left turn signal wire. In Step 3, insert the custom wiring end with the yellow wire between the separated driver-side vehicle taillight connectors, ensuring the connectors are fully inserted with locking tabs in place.
The green wire is the right turn signal wire. In Step 5, route the green wire over to the passenger side of the vehicle past the battery opening and through the passenger-side access panel, then install it into the factory taillight connector and taillight.
The black power wire connects to the positive (+) battery terminal using a ring terminal. Route 12 GA wire to the vehicle 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 it from sharp edges. Install the 15-amp fuse after all other steps are complete.
The white ground wire has a ring terminal. Secure it to the vehicle body using an existing screw or bolt in the frame, or drill a 3/32" pilot hole and use the provided ground screw. The area must be free from rust, dirt, and paint; use an abrasive pad or paper to clean it first.
The battery connection must be fuse-protected with a 15-amp maximum fuse. Exceeding this rating can cause loss of warranty, overheating, and potential fire. Install the fuse after all other steps are complete.
Signal circuits (left and right turn): 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.
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 where it will not interfere with vehicle operation or be damaged.
In Step 8, route the 4-flat to the floor board area for storage when not in use. When in use, route it 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 it up and store in a convenient, out-of-the-way location. Secure any loose wires with the provided cable ties.
1. Remove spare tire access cover and disconnect negative battery terminal. 2. Open driver-side panel hatch and locate vehicle taillight connectors. 3. Insert custom wiring with yellow wire between separated driver-side connectors. 4. Open passenger-side panel hatch. 5. Route green wire to passenger side and install into factory taillight connector. 6. Mount converter box with double-sided tape and route black power wire from battery. 7. Locate grounding point and secure white ground wire. 8. Route 4-flat connector, reinstall removed items, reconnect battery, and install dust cover.
The manual provides a wiring location guide for SUVs and Vans with ten possible locations: S1 (behind driver-side taillight), S2 (behind passenger-side taillight), S3 (behind driver-side rear access panel), S4 (behind passenger-side rear access panel), S5 (behind driver-side rear bumper), S6 (behind center of rear bumper), S7 (behind passenger-side rear bumper), S8 (under rear floor panel), S9 (behind driver-side rear access panel), and S10 (behind passenger-side rear access panel). For this product, wiring locations S1 and S2 are used.
Step 1 requires you to open the rear hatch and remove the spare tire access cover. You do not need to remove the spare tire itself, only the access cover. Use a panel trim tool to remove the three push fasteners from the plastic trim panel and remove it for reinstallation in Step 8.
In Step 2, open the driver-side panel hatch and locate the vehicle's taillight wiring connectors. Separate the connectors from the taillight housing, taking care not to damage the locking tabs. In Step 3, insert the custom wiring end with the yellow wire between the separated connectors, ensuring they are fully inserted with locking tabs in place. Repeat on the passenger side in Steps 4–5.
Do not lay tools across the positive battery terminal (typically marked with red covers or a '+' symbol) as this can cause a ground short, sparks, and electrical shocks. Before drilling, check for hidden items behind or under any surface to avoid damage and personal injury. Route the 12 GA power wire 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. Disconnect the negative battery before wiring the power wire.
After connecting the 12-volt power wire 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 test should be performed before completing the installation.
Periodic inspection of all wires and connections should be performed to ensure there is no visible damage or loose connections. Check the 4-flat connector and dust cover regularly to prevent corrosion.
The installation difficulty is rated as Easy. However, the manual notes that installation difficulty levels are based on time and effort involved and may vary depending on the installer's level of expertise, the condition of the vehicle, and proper tools and equipment.
The power wire is 12 GA (12-gauge) or larger. This wire connects from the vehicle battery to the converter using a ring terminal and must be routed to avoid pinch points and hot or rotating components.
Yes. In Step 8, you must reinstall all items removed during installation. This includes the spare tire access cover and the three push fasteners that were removed in Step 1.
The 4-flat connector is the trailer wiring connector that connects to a trailer's 4-pin lighting system. It is routed to the floor board area for storage when not in use. When in use, it is routed with the center of the vehicle and out of the hatch to the trailer. A dust cover is provided to help prevent corrosion.
After connecting the 12-volt power wire 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. If the converter does not function, check that: (1) the negative battery terminal is properly reconnected, (2) the 15-amp fuse is installed and not blown, (3) all wire connections are fully inserted with locking tabs in place, (4) the black power wire is connected to the positive battery terminal with a ring terminal, (5) the white ground wire is securely attached to the vehicle frame, and (6) all taillight connectors are properly seated.
Ensure that the connectors are fully inserted with locking tabs in place. If the connectors are not seating properly, check that you have not damaged the locking tabs when separating the original connectors from the taillight housing. The custom wiring connectors should be similar to the vehicle's original taillight connectors.
On Sale Today
Original price was $158.95. Current price is $124.99.You save $33.96 (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 Fri, Aug 14 - Sun, Aug 16
Order before 2 PM EST Monday–Friday for same-day processing
Guaranteed safe & secure checkout
No reviews have been added for this product.