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Shipping from Eau Claire, WIFREE SHIPPING
Estimated delivery Wed, Sep 9 - Fri, Sep 11
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Vehicle battery connection required
Warranty: One-Year Limited Warranty
Electrical System Type: 3W
Output Type: 4-Way Flat
Tail Light Circuits: 6.0 Amps
Turn and Brake Circuits: 3.0 Amps
Installation Difficulty: Professional
Installation Time Exact (Minutes): 40
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 Lexus IS F, IS200t, IS250, IS300 and IS350 (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
The CURT 56142 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Lexus IS F, IS200t, IS250, IS300, IS350 (Part #BKDK56142) fits the following vehicles: 2009-2014 Lexus IS F; 2016-2017 Lexus IS200t; 2009-2015 Lexus IS250; 2016 Lexus IS300; 2009-2016 Lexus IS350. Always verify your specific year, make, and model before ordering.
Yes, the CURT 56142 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Lexus IS F, IS200t, IS250, IS300, IS350 (Part #BKDK56142) is designed to fit the 2009-2014 Lexus IS F.
The CURT 56142 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Lexus IS F, IS200t, IS250, IS300, IS350 (Part #BKDK56142) fits 2009-2014 Lexus IS F models. The 2017 model year is the last year covered by this part number. For newer models, check for an updated version.
The CURT 56142 Vehicle-Side Custom 4-Pin Trailer Wiring Harness, Fits Select Lexus IS F, IS200t, IS250, IS300, IS350 (Part #BKDK56142) Typical installation time is 30-60 minutes. Basic hand tools are typically all you need.
Yes, Curt part 56142 is designed for Lexus IS 250 and Lexus IS 350 models. The T-Connector wiring harness integrates with the factory taillight connectors on both sides of the trunk.
The kit includes a T-Connector harness with yellow and green wire ends, a black converter box, a white ground wire with eyelet, double-sided tape, cable ties, a screw for grounding, and a 4-flat connector for use when needed. A separate CME-PCL-INS instruction sheet covers routing of the black power wire from the battery.
Open the trunk and remove: all trunk floor covers, the rear scuff panel (held by three plastic fasteners and cargo loops), and plastic fasteners holding the felt trunk liner in place on both sides. These items are reinstalled after installation.
On the driver's side, pull back the felt trunk liner to locate the factory taillight wiring harness connectors. Separate the connectors carefully without damaging the locking tabs. Insert the T-Connector end with the yellow wire between the separated connectors, ensuring both connectors are fully inserted with locking tabs in place. Repeat this process on the passenger side using the T-Connector end with the green wire.
Locate a flat spot on the inside body panel of the vehicle behind the felt trunk liner near the connector. Adhere the black converter box using the double-sided tape provided.
Not necessarily. First, locate a suitable grounding point near the connector, such as an existing screw with nut in the vehicle's frame. If no suitable point exists, drill a 3/32" hole and secure the eyelet of the white ground wire using the screw provided.
Route the T-Connector end with the green wire across to the passenger side behind the removed scuff panel. Use the cable ties provided to secure wires to an existing wiring harness. Route the 4-flat connector from under the felt trunk liner to the center of the vehicle and out of the trunk when in use. Roll up and store in an out-of-the-way location when not in use. Refer to the CME-PCL-INS instruction sheet for routing the black power wire from the battery to the converter.
Before drilling, verify that miscellaneous items hidden behind or under any surface will not be damaged. Drilling without checking can cause damage and/or personal injury.
When separating the factory taillight connectors, take care not to damage the locking tabs. The locking tabs must be in place when the T-Connector is fully inserted.
Yes, the Curt 56142 T-Connector is designed for Lexus IS 250 and IS 350 models.
Drilling is optional. A 3/32" hole is only needed if no suitable existing grounding point (screw with nut) is available in the vehicle's frame.
Basic hand tools for removing plastic fasteners and cargo loops, a screwdriver for the grounding screw, and optionally a drill with a 3/32" bit if a grounding hole is needed. Cable ties and double-sided tape are provided.
Remove all trunk floor covers, the rear scuff panel (three plastic fasteners and cargo loops), and plastic fasteners holding the felt trunk liner on both sides. All items are reinstalled after installation.
Locate the factory taillight connectors behind the felt trunk liner on each side. Separate them carefully without damaging the locking tabs. Insert the yellow-wire T-Connector end on the driver's side and the green-wire end on the passenger side between the separated connectors, ensuring full insertion with locking tabs in place.
5 compatible vehicles
| Year | Make & Model | Notes |
|---|---|---|
| 2009 - 2014 | Lexus IS F | Installation Time: 30-60 minutes |
| 2016 - 2017 | Lexus IS200t | Installation Time: 30-60 minutes |
| 2009 - 2015 | Lexus IS250 | Installation Time: 30-60 minutes |
| 2016 | Lexus IS300 | Installation Time: 30-60 minutes |
| 2009 - 2016 | Lexus IS350 | Installation Time: 30-60 minutes |
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