Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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2002 Toyota Highlander
These items fit your vehicle
2002 Toyota Highlander
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Adding trailer wiring doesn’t have to mean tapping into factory wires. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs right into existing connectors behind the rear trim. It’s a straightforward setup with no splicing, cutting, or wire tracing required—just plug it in and you’re ready for towing lights.
Factory wiring is delicate and costly to replace, so this harness includes a circuit-protected powered converter built with surface mount technology. It uses only about 5 milliamps from the tail light circuits to trigger the converter, which then draws power directly from the battery to run trailer lights. That setup keeps the vehicle’s internal wiring isolated and safe from shorts or overloads on the trailer side.
The included 4-flat connector provides the basic lighting functions needed for safe towing—running lights, turn signals, and brake lights. It’s the standard plug used on most small and mid-size trailers, so once it’s installed, you can easily hook up and go.
If you need more capability later—like trailer brakes or a 12V charge line—the 4-way from this harness can connect to a 4-to-7 adapter such as part #37185 or a full brake controller kit like #ETBC7. That means you can start simple and expand your towing setup without having to replace your existing wiring.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Brooke M.
11/26/2024
Thats awesome, Steve! So glad to hear this harness worked out for you. There is nothing like a project thats completed smoothly!
Steve
11/27/2025
FSNTASTIC!!!
Jtw
12/18/2014
Weve put many miles on our Acura MDX trailer tow package from ETrailer and the whole rig right down to the wiring has performed flawlessly.
Marshall
7/5/2016
Installation was simple. Only took a few minutes and with the video instructions you can go wrong.
Jim H.
1/18/2016
After a year Im still very pleased with my receiver and wiring. I use the receiver at least weekly for a Thule bike rack, but the wiring harness only rarely.
Sam N.
3/16/2015
I had the same problem. I had to watch the video on the website. The instructions included with the harness provide almost no help. Once I put in the fuse, the harness works fine. Also, the harness does not come with the pictured dust cover. Etrailer customer service is great and sent me a dust cover at no charge.
Tow H.
7/8/2016
All good thanks for the follow up!!
Mike
10/29/2018
George, the wiring worker well. Everything fit as promised. Thanks
John H.
5/21/2020
Still working great after a year of infrequent use but good to have.
John O.
5/17/2018
The install still looks and works great.
Mikecrowley
1/2/2019
Both products are awesome. Perfect fit harness and even better hitch that is very heavily built. Love them.
Mike
10/29/2018
Although Ive not had a opportunity to use the harness, it meter check out.
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Lazer S.
9/30/2025
Install looks great, Tracy! What are you going to be towing?