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Hooking up trailer wiring doesn’t have to be complicated. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs straight into the vehicle’s wiring, so there’s no need to cut or splice factory wires. The plug-in design keeps things simple and helps you get your trailer lights working in no time.
This harness includes a powered converter that connects directly to the vehicle battery. That built-in power source keeps the trailer lights from overloading the vehicle’s taillight circuits. It draws power only when the lighting functions are active, giving you reliable performance without draining the battery.
The 4-flat connector provides the running, turn, and brake light signals your trailer needs for safe travel. It’s the most common trailer connection out there, making it easy to hook up to most small and mid-size trailers without extra adapters.
When it’s not in use, keep the 4-way end covered to protect it from dirt and corrosion. For a solid electrical connection every time, apply dielectric grease at plug points and make sure the ground is attached to clean, bare metal. These small steps help the Curt T-Connector stay dependable whether you tow often or just occasionally.
The harness is rated to deliver 5.6 amps on the running light circuit, giving it enough capacity for typical trailer marker and clearance lights. Follow proper installation practices—especially grounding and fuse protection—and you’ll have stable lighting that performs trip after trip.

Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Plugs right in, easy.
good
Great service. Knowledgeable. Fast shipping. Great price
This is just what I need easy to install better than cutting wires all that
Everything worked as described. Quick delivery and even greater price.
Super fast and easy install. 15 mins and it was in and ready
Worked as it should
This product is exactly what I was looking for. No cutting and splicing, easy and clean install. What else is there to say? I highly recommend this harness for your trailer plug need.
The wiring harness works great and was easy to install.
After buying four of these hitches in the last four years, what more could I say. I think that would have been recoginized by your company and been given a small discount for buying from you so frequently. Enough said about that. Frequent customer.
Thank you for shipping so fast. I already put the hitch on. and wiring is also installed. Good directions and great looking. Thank you again.
I bought the C56145 custom wiring kit it is a must have item. The dealer wanted $300 for the wiring kit + $ to install. I save a lot by doing it myself and thank "etrailer.com" for handling a fine product.
Respectfully,
Larry Royal
I was able to do a quick and professional looking wiring installation with your kit. I would recommend it to others.
Everything was great with only one exception. The instruction state to be careful removing the wire connectors from the taillight. With no instructions on how to remove them. 1. Push the red sliding saftey clip back.
2. push down on the black clip and gently pull the socket apart using a side to side motion. Henry
Perfect fit connectors and very convenient to not need to splice into factory wires.
Fast delivery, perfect fit, great u-tube installation instructions, lowest price. Thank you e-trailer!
It was great except the wires are about 8 in short on the driver side had to splice some in

Donald A.
6/20/2026
A year later it still works I havent used it that often so far so good
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Jim P.
4/21/2016
Everything is working well. Im glad to have etrailer my primary source for my towing needs. Respectfully,