Tekonsha 118525 T-One 4-Way Flat Wiring Harness
Tekonsha 118525 T-One 4-Way Flat Wiring Harness — Product description
The Tekonsha 118525 is a T-One vehicle-specific wiring harness that gives select 2005-2011 Nissan owners a clean 4-way flat trailer connector without cutting or splicing a single factory wire. It plugs into your Nissan's existing harness and puts a standard 4-flat plug right where you need it.
If you tow with a 2005 to 2011 Nissan, the Tekonsha 118525 T-One connector is about the easiest trailer wiring you'll ever install. It's built to replace the factory OEM wiring harness on select Nissan vehicles from those model years, and it gives you a standard 4-way flat plug on the back of the truck. No test light, no scotch locks, no guessing which wire does what.
Here's how it works. Tekonsha's T-One design uses a vehicle-specific connector that plugs straight into your Nissan's existing wiring. You unclip the factory connector, snap the T-One in line, and route the 4-flat pigtail to the rear. That's the install. Because it taps the signals at the factory plug, your trailer's running lights, left and right turn signals, and brake lights all get clean, correctly matched power off the vehicle's own circuits.
The 4-way flat output is the most common small-trailer connector out there. Utility trailers, small boat trailers, landscape and cargo haulers, most of them terminate in a 4-flat. So this harness sets you up to tow just about anything that runs basic lighting without brakes. If you later move up to a trailer with electric brakes, you'd step up to a different connector, but for the huge majority of light towing this is exactly what you want.
What we like about the T-One approach is that it keeps your factory wiring intact. Nothing gets cut. If you ever sell the vehicle or swap trailers, you can unplug it and you're back to stock. It also means no corroded splice connections down the road, which is the number one reason cheap universal harnesses fail.
One thing to check before you order. Confirm your specific Nissan model and year fall within the 2005 to 2011 fitment for part 118525. Tekonsha builds these harnesses vehicle-specific, so the connector has to match your factory plug. If you're not sure, send us your year, make, and model and we'll confirm it fits before it ships.
Key Features
- T-One vehicle-specific connector plugs into your Nissan's factory wiring, no cutting or splicing required
- 4-way flat output fits the most common utility, boat, and cargo trailer plugs
- Fits select 2005-2011 Nissan vehicles (part number 118525) for a factory-matched connection
- Powers trailer running, left and right turn, and brake lights off the vehicle's own circuits
- Replaces the OEM towing harness while leaving factory wiring fully intact for easy removal
- Backed by Tekonsha, a longtime leader in trailer wiring and brake control
Why Buy from NVN Marine
- Authorized Tekonsha reseller, full manufacturer warranty
- NMEA member and ABYC certified, advice from real boat techs
- Same-day shipping before 3 PM ET on in-stock items
- NY headquarters and Fort Lauderdale flagship retail store
Technical specifications
| Title | 4-Way Flat Replacement For OEM Wiring Harness |
|---|---|
| Brand | Tekonsha |
| Manufacturer Part Number | 118525 |
| UPC | 016118108514 |
| Series | T-One |
| Connector Type | Vehicle-specific plug-in (T-connector) |
| Output Connector | 4-Way Flat |
| Vehicle Fitment | Select 2005-2011 Nissan |
| Replaces | OEM towing wiring harness |
| Signals Supported | Tail/running, left turn, right turn, brake |
Frequently asked questions
What vehicles does the Tekonsha 118525 fit?
It's built for select 2005 to 2011 Nissan vehicles. Tekonsha designs the T-One connector vehicle-specific, so before ordering, confirm your exact year, make, and model match part number 118525. If you're unsure, we're happy to verify fitment for you.
Do I have to cut or splice any wires to install it?
No. The T-One connector plugs directly into your Nissan's existing OEM wiring. You unclip the factory connector, snap the harness in line, and route the 4-flat pigtail to the rear of the vehicle. No test light or wire splicing needed.
What kind of trailer connector does it provide?
A standard 4-way flat plug. That's the most common connector on small utility trailers, boat trailers, and cargo trailers that run running lights, turn signals, and brake lights without electric brakes.
Does this harness support trailer brakes?
No. A 4-way flat connector carries lighting signals only, meaning tail, turn, and brake lights. If your trailer has electric brakes, you'd need a different connector and a brake controller.
Will installing it affect my factory wiring?
The T-One design leaves your factory wiring completely intact. Nothing is cut. If you sell the vehicle or change trailers, you can unplug the harness and return the wiring to stock.
What's included with part 118525?
The T-One wiring harness with the vehicle-specific connector and the 4-way flat output pigtail. Everything needed for the plug-in connection is in the box. Check your specific application for exact routing.
