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Warranty: One-Year Limited Warranty
Electrical System Type: 2W
Output Type: 4-Way Flat
Installation Difficulty: Novice
Installation Time Exact (Minutes): 20
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 Chevy Express and GMC Savana 1500, 2500, 3500 and 4500 (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 888-634-9494Rediscover "Us" Time | Tested. Proven. Safe. Towing Products
Yes, the CURT Custom Wiring, 4-Flat, Select Chevy Express, GMC Savana 1500, 2500, 3500, 4500 Trailer Connector Kit (Part #BKDK55540) is designed to fit the 2003-2014 Chevrolet Express 1500.
The CURT Custom Wiring, 4-Flat, Select Chevy Express, GMC Savana 1500, 2500, 3500, 4500 Trailer Connector Kit (Part #BKDK55540) fits the following vehicles: 2003-2014 Chevrolet Express 1500; 2003-2026 Chevrolet Express 2500; 2003-2026 Chevrolet Express 3500; 2003-2014 GMC Savana 1500; 2003-2026 GMC Savana 2500; 2003-2026 GMC Savana 3500. Always verify your specific year, make, and model before ordering.
The CURT Custom Wiring, 4-Flat, Select Chevy Express, GMC Savana 1500, 2500, 3500, 4500 Trailer Connector Kit (Part #BKDK55540) fits 2003-2014 Chevrolet Express 1500 models. The 2026 model year is the last year covered by this part number. For newer models, check for an updated version.
The CURT Custom Wiring, 4-Flat, Select Chevy Express, GMC Savana 1500, 2500, 3500, 4500 Trailer Connector Kit (Part #BKDK55540) Typical installation time is 30-60 minutes. Basic hand tools are typically all you need.
Yes, the Curt 55540 is designed for Chevrolet Express 1500, Express 2500/3500, GMC Savana 1500, and Savana 2500/3500 models. It is compatible with SUVs, mini and full-sized vans in the S category.
The Curt 55540 is a custom wiring harness that integrates with your vehicle's taillight wiring to enable trailer lighting functions. It connects between the vehicle's taillight connectors and allows you to control trailer lights through your vehicle's lighting system.
Yes, you must disconnect the negative battery terminal before beginning installation. Reconnect it only after all installation steps are complete and all trim panels have been reinstalled.
You will need a ratchet and a 10mm socket. A drill may be required if a suitable existing grounding point is not available on your vehicle frame.
You must remove the rear trim fascia and interior trim panels near the rear entry doors on both the driver and passenger sides. The harness routes behind these panels to access the taillight connectors.
Locate the vehicle's taillight wiring harness connectors near the rear entry doors. Separate the connectors from the taillight housing carefully to avoid damaging the locking tabs. Insert the custom wiring harness end with the yellow wire between the separated connectors, ensuring they are fully inserted with locking tabs in place.
Locate a suitable grounding point near the connector, such as an existing screw with nut in the vehicle frame. The area must be free of rust, dirt and paint. Secure the white ground wire using the ring terminal and provided screw. If no suitable existing point is available, drill a 3/32" pilot hole for the provided screw.
Drilling is required only if a suitable existing grounding point is not available on your vehicle frame. If needed, you will drill a 3/32" pilot hole for the provided grounding screw. Before drilling, check for hidden items behind or under any surface to avoid damage and personal injury.
Route the custom wiring harness end with the green wire to the passenger side behind the removed trim panels. Enough wire has been provided to route the wire either under the threshold plate or above the rear cargo doors. Tuck the green wire under the floor trim panel before reinstalling the rear trim panels.
Once installed, test for proper function by using a test light or connecting a properly wired trailer. All steps must be followed to ensure the wiring harness functions properly.
Do not exceed the product rating or your tow vehicle's lamp load rating, whichever is lower. Exceeding the product rating can cause loss of warranty, overheating and potential fire. Refer to your vehicle owner's manual or contact the vehicle manufacturer for your specific lamp load rating.
The provided 4-flat dust cover should be installed to help prevent corrosion of the trailer connector. Install it after reconnecting the negative battery terminal and reinstalling all removed items.
No, you must remove the rear trim fascia and interior trim panels near the rear entry doors to access the taillight wiring connectors on both sides of the vehicle. These panels must be removed to properly connect the harness.
The Curt 55540 fits Chevrolet Express 1500, Express 2500/3500, GMC Savana 1500, and Savana 2500/3500 models.
Yes, disconnect the negative battery terminal before starting installation and reconnect it after all steps are complete.
You need a ratchet, 10mm socket, and possibly a drill if no existing grounding point is available.
Drilling is only required if no suitable existing grounding point is available; you would drill a 3/32" pilot hole for the provided screw.
Do not exceed the product rating or your vehicle's lamp load rating, whichever is lower, as this can cause overheating and potential fire.
6 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2003 - 2014 | Chevrolet Express 1500 | Installation Time: 30-60 minutes |
| 2003 - 2026 | Chevrolet Express 2500 | Installation Time: 30-60 minutes |
| 2003 - 2026 | Chevrolet Express 3500 | Installation Time: 30-60 minutes |
| 2003 - 2014 | GMC Savana 1500 | Installation Time: 30-60 minutes |
| 2003 - 2026 | GMC Savana 2500 | Installation Time: 30-60 minutes |
| 2003 - 2026 | GMC Savana 3500 | Installation Time: 30-60 minutes |
Total for 4 items:
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