Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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2020 Mazda CX-3
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2020 Mazda CX-3
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Trailer wiring doesn’t have to mean cutting into factory wires. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs in directly behind the tail lights, giving you a simple plug-and-play setup. No splicing or programming needed—just connect the T-plugs, route the power wire to the battery, and you’re ready for trailer lights.
Towing can draw more current than factory lighting circuits are designed for. This harness uses a powered tail light converter that takes its power straight from the battery. That isolates the trailer load and protects your vehicle’s internal wiring from shorts or overloads caused by trailer issues. It’s built for peace of mind every time you hook up.
Once installed, the 4-pole flat connector provides running lights, brake lights, and turn signals for your trailer—all the key lighting functions you need for safe towing. It’s a standard connection that works with most small and mid-size trailers and can be expanded later with an adapter if you decide to add a 7-way setup for brakes or battery charge lines.
The custom connectors fit snugly into the factory tail light ports to maintain a solid electrical connection. The powered converter is sealed and designed for reliability even when exposed to moisture or road grime, so your trailer lights stay working trip after trip.
Customer Satisfaction Score:
95% were satisfied with this product
5% of customers were not satisfied
Ratings & Reviews
Lazer S.
4/28/2026
Glad to hear it, Joe! What are you towing with your Cherokee?
Charlie
9/7/2025
Still working
Jenny N.
5/29/2023
There could be more than one reason why the trailer lights are staying on constantly, starting with a corroded connector. What corrosion does is cause a short which can lead to the lights staying on, and when you unplug the connectors, they would, of course, turn off. So, start by checking there, and if you cannot clean the corrosion, you can replace the connectors on either the side of your vehicle or trailer. The other possibility is a short caused by damaged wiring on the trailer itself that is causing the power to remain, so you will want to check your wiring carefully looking for any damaged wires and repair or replace as needed with 10-gauge wire part # 10-1-1. I have added a link below to a help article on a troubleshooting guide for you to take a look at.
Helpful Links
Gary
5/24/2024
Still having issues with the wiring. lights are not working, took to an expert and they say its in the harness box
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Kate F.
8/20/2026
Thanks, Dray! We’re so glad the T-Connector got everything working and your trailer back on the road. Thanks for including the pictures as well.