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Fits standard 2-wire system
Warranty: One-Year Limited Warranty
Electrical System Type: 2W
Output Type: 4-Way Flat
Installation Difficulty: Novice
Installation Time Exact (Minutes): 5
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 Ford F150, F250, F250 HD and F350 (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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4 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 1987 - 1996 | Ford F-150 | Installation Time: 30-60 minutes |
| 1987 - 1996 | Ford F-250 | Installation Time: 30-60 minutes |
| 1997 | Ford F-250 HD | Installation Time: 30-60 minutes |
| 1987 - 1997 | Ford F-350 | Installation Time: 30-60 minutes |



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Yes, the CURT Custom Wiring Harness, 4-Way Flat Output, Select Ford F-150, F-250, HD, F-350 Trailer Connector Kit (Part #BKDK55316) is designed to fit the 1987-1996 Ford F-150.
The CURT Custom Wiring Harness, 4-Way Flat Output, Select Ford F-150, F-250, HD, F-350 Trailer Connector Kit (Part #BKDK55316) fits the following vehicles: 1987-1996 Ford F-150; 1987-1996 Ford F-250; 1997 Ford F-250 HD; 1987-1997 Ford F-350. Always verify your specific year, make, and model before ordering.
The CURT Custom Wiring Harness, 4-Way Flat Output, Select Ford F-150, F-250, HD, F-350 Trailer Connector Kit (Part #BKDK55316) fits 1987-1996 Ford F-150 models. The 1997 model year is the last year covered by this part number. For newer models, check for an updated version.
The CURT Custom Wiring Harness, 4-Way Flat Output, Select Ford F-150, F-250, HD, F-350 Trailer Connector Kit (Part #BKDK55316) Typical installation time is 30-60 minutes. Basic hand tools are typically all you need.
Yes, the Curt 55316 is designed for Ford F-150 pickup trucks. It is also compatible with Ford F-250, F-350, F-250 heavy duty, and F-350 heavy duty models. Confirm your vehicle matches one of these applications before purchasing.
Yes, the Curt 55316 is compatible with Ford F-250, F-350, F-250 heavy duty, and F-350 heavy duty pickup trucks, as well as the F-150.
The Curt 55316 is a custom wiring harness that connects to your vehicle's taillight wiring. The harness end with the yellow wire inserts between the separated taillight connectors. The harness terminates in a 4-flat connector for trailer use.
Lowering the spare tire is not required but may ease installation. The manual notes that lowering the vehicle spare tire may make the installation easier, so consider this if you encounter tight access to the taillight connectors.
1. Locate the vehicle taillight wiring harness connectors and separate them from the taillight housing, taking care not to damage the locking tabs. 2. Insert the custom wiring harness end with the yellow wire between the separated connectors, ensuring they are fully inserted with locking tabs in place. 3. Route the 4-flat connector to the center of the vehicle and out of the trunk when in use; roll up and store in the trunk when not in use. Secure loose wires with the provided cable ties. 4. Reinstall all removed items and install the provided 4-flat dust cover.
When in use, route the 4-flat connector to the center of the vehicle and out of the trunk. When not in use, roll up and store in a convenient, out-of-the-way location inside the trunk.
The Curt 55316 includes the custom wiring harness with a yellow wire end, cable ties for securing loose wires, and a 4-flat dust cover to help prevent corrosion.
Do not exceed the product rating or your tow vehicle lamp load rating, whichever is lower. Exceeding the product rating can cause loss of warranty, overheating, and potential fire. Check your vehicle owner's manual or contact the vehicle manufacturer for your specific lamp load rating.
After installation, test for proper function by using a test light or by connecting a properly wired trailer. All steps must be followed to ensure the wiring harness functions properly.
The yellow wire is the end of the custom wiring harness that inserts between the separated taillight connectors during installation. It is part of the connector interface that links the harness to your vehicle's taillight wiring.
The provided 4-flat dust cover helps prevent corrosion of the 4-flat connector. Install it after completing the wiring harness installation.
Yes, you must take care not to damage the locking tabs when separating the taillight connectors. Handle the connectors carefully during Step 1 to avoid damaging these tabs, which are essential for securing the connections.
The Curt 55316 fits Ford F-150, F-250, F-350, F-250 heavy duty, and F-350 heavy duty pickup trucks.
Do not exceed the product rating or tow vehicle lamp load rating, whichever is lower. Exceeding the rating can cause loss of warranty, overheating, and potential fire.
The manual lists no tools as needed for installation.
Test for proper function using a test light or by connecting a properly wired trailer.
The harness includes cable ties for securing wires and a 4-flat dust cover to prevent corrosion.
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