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Select your vehicle to confirm this part fits.
2008 - 2011 Mazda Tribute
Confirmed to Fit
2008 - 2011 Mercury Mariner
Confirmed to Fit





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Always the correct part
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Plugs into existing OEM vehicle socket to provide a 4-way flat socket

| Material | THERMOPLASTIC RUBBER |
CURT custom wiring connectors are the easiest way to outfit your vehicle with a CURT trailer wiring connection. They are built with some of the most advanced technology in the industry, and each one is custom-fitted to work with a specific make and model. Some automotive manufacturers install a special socket on the vehicle to be used for vehicle-to-trailer wiring. Although this special socket is not equipped on every vehicle, a CURT custom wiring connector -- also called a T-connector -- utilizes the socket for simple, stress-free installation. Rather than requiring you to cut, splice and solder into your vehicle's wiring system, the custom wiring connector uses a single OEM-compatible plug and instantly provides a standard, universal vehicle-to-trailer wiring connection, typically in the form a 4-way flat. 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 Ford Escape, Mazda Tribute, and Mercury Mariner (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®.'
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Call 888-634-9494One-Year Limited
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3 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2008 - 2012 | Ford Escape | Excluding back up sensors |
| 2008 - 2011 | Mazda Tribute | — |
| 2008 - 2011 | Mercury Mariner | — |
The CURT 56558 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Escape, Tribute, Mariner (Part #BKDK56558) fits the following vehicles: 2008-2012 Ford Escape; 2008-2011 Mazda Tribute; 2008-2011 Mercury Mariner. Always verify your specific year, make, and model before ordering.
The CURT 56558 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Escape, Tribute, Mariner (Part #BKDK56558) fits 2008-2012 Ford Escape models. The 2012 model year is the last year covered by this part number. For newer models, check for an updated version.
Yes, the CURT 56558 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Escape, Tribute, Mariner (Part #BKDK56558) is designed to fit the 2008-2012 Ford Escape.
The CURT 56558 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Escape, Tribute, Mariner (Part #BKDK56558) Refer to the included instructions for installation details. Basic hand tools are typically all you need.
The Curt 56558 is a T-connector trailer tow harness that connects to your vehicle's factory trailer tow harness connector. It allows you to connect a trailer's electrical connector to your vehicle's towing system, enabling trailer lights and brake signals to function properly.
The Curt 56558 is designed for vehicles equipped with a factory trailer tow harness connector located on the driver side underneath the vehicle. Check under your vehicle on the driver side to confirm you have this connector before purchasing. The manual does not list specific vehicle makes, models or years.
You will need: a ratchet, wire cutters, a 10mm socket, and a test light. The test light is used after installation to verify the harness is functioning correctly.
The package includes the T-connector trailer tow harness, cable ties for securing loose wires, and a 4-flat dust cover to help prevent corrosion. A bracket for securing the 4-way connector is not included and must be sourced separately.
Yes. You must disconnect the negative battery terminal before beginning installation. Using a 10mm socket, remove the negative battery terminal and isolate it to prevent it from making contact with a metal object, which could damage the vehicle's electrical system.
1. Disconnect the negative battery terminal using a 10mm socket and isolate it. 2. Locate the factory trailer tow harness connector on the driver side underneath the vehicle. 3. Remove the protective plug carefully without damaging the connector mounting tabs. 4. Insert the trailer tow harness into the mating vehicle connector, being careful not to break or damage the connector tabs. 5. Route the 4-way flat connector along the rear bumper fascia to the center of the vehicle and secure it into a bracket (not included). 6. Secure any loose wires with the provided cable ties. 7. Reconnect the negative battery terminal and install the provided 4-flat dust cover. 8. Test the harness with a test light, 4-flat tester, multimeter, or functioning trailer to verify proper operation.
Set the protective plug aside after carefully removing it. Be careful not to damage the connector mounting tabs during removal. The manual does not specify whether the plug should be retained or discarded after installation.
Route the 4-way flat connector along the rear bumper fascia and over to the center of the vehicle. Secure it into a bracket (not included) and secure any loose wires with the provided cable ties to prevent damage and ensure a neat installation.
Do not exceed the product rating or your tow vehicle's lamp load rating, whichever is lower. The manual does not specify the product's maximum rating. Contact Curt Manufacturing or consult your vehicle's owner manual for specific capacity information.
Yes. The battery connection must be fuse-protected. Exceeding the product rating without proper fuse protection can cause loss of warranty, overheating, and potential damage to the vehicle's electrical system.
After installation, verify that the harness is functioning by attaching the battery and testing with a test light, 4-flat tester, multimeter, or a functioning trailer. This confirms all connections are correct and the harness is ready for use.
Perform periodic inspection of all wires and connections to ensure there is no visible damage or loose connections. This helps prevent corrosion and electrical failures. The provided 4-flat dust cover should be installed to help prevent corrosion.
The Curt 56558 requires a factory trailer tow harness connector on the driver side underneath your vehicle. Check for this connector before purchasing. The manual does not list specific vehicle compatibility.
You need a ratchet, wire cutters, 10mm socket, and test light. A bracket for securing the 4-way connector is not included and must be sourced separately.
Yes, you must disconnect the negative battery terminal using a 10mm socket before beginning installation to prevent electrical damage.
Yes, the battery connection must be fuse-protected. Exceeding the product rating without proper fuse protection can cause overheating and damage.
Test the harness with a test light, 4-flat tester, multimeter, or functioning trailer to confirm proper operation before towing.





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