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Wiring up for trailer lights doesn’t have to mean chasing wires or cutting into the factory harness. The Curt T-Connector uses a plug-in design that connects directly behind the tail lights. The connectors match up exactly with the factory plugs, so you get a clean install with no guesswork or splicing.
The built-in powered converter draws power directly from the vehicle’s battery instead of the tail light circuits. That keeps your vehicle’s wiring protected from overloads while powering your trailer lights reliably. It’s the right way to handle the extra load from trailer bulbs or LED lighting.
Once installed, the harness gives you a standard 4-flat trailer connector for running lights, turn signals, and brake lights. It’s the same connector used on most small and mid-size trailers, so you can hook up and go without any adapters or extra wiring.
Some users route the converter box and 4-flat plug into interior spaces like a spare tire well to protect them from rain and road salt. With its compact, hidden design and solid seals at connection points, it’s easy to keep everything tucked away and ready when you need it.
If you decide to add electric brakes or 12V trailer charging later, this harness is the first step. You can pair it with a universal 7-way installation kit to add those functions without starting over. It’s a simple way to grow your setup as your towing needs change.
Customer Satisfaction Score:
87% were satisfied with this product
13% of customers were not satisfied
Ratings & Reviews
Gwendolyn Y.
11/25/2024
Hey Thomas. That doesn't sound like a pleasant experience. I do see you spoke to William and he's going to make sure you get a full refund on your order.
Lazer S.
1/6/2026
Sorry you had to go through all that, Michael. There have been some weird instances like this that have popped up and I will be bringing to to our fit-guide team as well as Curt to see if we can get everything fixed. As this was definitely no fault of your own, I will make sure you will not be charged for any kind of return shipping and will see if I can get the shipping charge for the new harness credited back to you as well. It looks like the new harness is scheduled for delivery on the 9th (9434650105497022250693). Let me know how the install goes and if you run into any issues.
Michael
1/16/2026
UPDATE: eTrailer was quick to resolve their issue and send me the correct harness for our vehicle. Took a few hours to install due to running the power wire to the battery but it was an easy job and everything worked as it should.
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Alan
10/17/2025
I ordered the wrong part and they fixed it for me. It was totally my mistake, and I contacted them, and explained my problem. I expected it to be a lot of problems to correct, but they simply sent the correct item and credited once I return the wrong one. I saw someone else say the same thing in these reviews that a wiring harness is pretty basic I would order from these people again because of the customer service