Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
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2019 Nissan Titan
These items fit your vehicle
2019 Nissan Titan
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Wiring a trailer doesn’t have to mean cutting into factory wires. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into the existing wiring in the rear cargo area. It’s a true plug-and-play setup—no splicing, no tap connectors, and no guesswork. Once connected, it’s ready to send the correct running light, turn signal, and brake light signals straight to your trailer.
The harness stays tucked away inside the vehicle when not in use and can be routed through an existing grommet if you want it outside near the hitch. That means no dangling wires and no drilling unless you choose to. When you’re ready to tow, just pull out the 4-way flat connector and plug it in; when you’re done, stow it away again for a clean look.
This harness includes an integrated converter that matches your vehicle’s lighting system to your trailer’s two-wire setup. It takes in the stop, turn, and running light signals and converts them accurately for the trailer lights. The solid-state surface mount circuitry inside the converter ensures consistent power delivery to your trailer lights.
Whether your trailer uses LEDs or traditional bulbs, this harness handles both without modification. The 4-flat plug delivers the standard functions most small and mid-size trailers need—running lights, turn signals, and brake lights—so you can hook up confidently and hit the road right away.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
Richard L.
1/28/2018
Thank you for your interest in my satisfaction! I find it hard to believe you can follow up on every purchase made online but I feel good that you are asking for my opinion.Let me assure you that I am completely, 100 satisfied with the Curt hitch and wiring harness that I bought. It was a piece of cake to install ok, Im a mechanic and it is probably stronger than the car I installed it on. I have pulled my trailer with complete confidence and am delighted in the products you offer.Thank you!
Sergio G.
11/21/2017
Everything is working properly and if I ever need any similar products I’m sure I will purchase them from etrailer.
Joseph B.
4/17/2018
The Curt hitch and wiring harness are performing as designed with no problems.
Mike L.
9/6/2018
When a trailer wiring harness goes bad especially multiple units, a short circuit somewhere in the wiring on the trailer is the usual suspect. Since the problem is occurring in the left turn signal circuit, Id recommend beginning at the connector on the trailer, and tracing that circuit from the trailer connector all the way back to the taillight. The left turn circuit usually uses a green wire. Look for pinched wires, loose connections, or wires with cracked or worn insulation. Ill link you to some helpful articles about trailer wiring that might also be of assistance.
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Adam
5/25/2025
Connector is still working fine after a year. No issues. The install sucked, but I’m glad I installed it because being able to pull a trailer has been very handy with all the renovations we’re doing on our home.