Tekonsha 118811 T-One 4-Way Flat, VW Tiguan
Tekonsha 118811 T-One 4-Way Flat, VW Tiguan — Product description
The Tekonsha 118811 is a T-One vehicle wiring harness built specifically for the 2018-2020 Volkswagen Tiguan. It plugs into your Tiguan's factory wiring and gives you a 4-way flat connector on the vehicle side, so you can wire up a small trailer's tail lights, turn signals, and brake lights without cutting a single wire.
If you're setting up your 2018-2020 Volkswagen Tiguan to tow, the wiring is usually the part that trips people up. The Tekonsha 118811 takes that worry off the table. It's a custom-fit T-One harness made for this exact vehicle, so the connectors match your Tiguan's factory plugs right out of the box.
Here's how it works. The harness taps into the wiring already running to your Tiguan's tail lights using the factory connectors. No cutting, no splicing, no soldering, and no guessing which wire does what. You route the harness to the back, plug it in, and mount the 4-way flat connector where you can reach it at the hitch. That's the vehicle side of the connection, the part that stays on your tow vehicle. Most folks knock this out in well under an hour with basic hand tools.
The 4-way flat itself is the most common trailer lighting standard out there. It carries four circuits: taillights, left turn and brake, right turn and brake, and a ground. That's everything a small trailer needs for legal, safe lighting on the road. Think utility trailers, small boat trailers, teardrop campers, or a bike rack with integrated lights.
What a 4-way flat doesn't do is run electric trailer brakes or charge a trailer battery. Those need extra circuits, a bigger connector, and a brake controller. So if you're towing something light that just needs lights, this is exactly right. If you've got a heavier trailer with its own brakes, you'll want a larger connector setup instead.
Tekonsha has been building towing electronics for a long time, and the T-One line is their plug-and-play answer to modern vehicle wiring. A vehicle-specific harness like this one beats fighting with a universal kit. The fit is clean, the install is quick, and you're not left tracing wires under the dash. And because it's matched to the Tiguan, your factory wiring stays intact, which is nice if you ever sell the vehicle or pull the setup back off. For a Tiguan owner who wants to tow a light trailer without turning it into a weekend project, the 118811 is the straightforward way there.
Key Features
- Custom-fit T-One harness engineered for the 2018-2020 Volkswagen Tiguan, no universal-kit guesswork
- Plugs into the Tiguan's factory wiring using OEM connectors, so there's no cutting, splicing, or soldering
- 4-way flat output powers trailer taillights, left and right turn/brake signals, and a ground
- Vehicle-side harness mounts on the tow vehicle and keeps your factory wiring intact
- Ideal for light trailers that need lighting only, like utility, small boat, or teardrop trailers
- Backed by Tekonsha, a longtime name in towing electronics, with full manufacturer warranty
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 | Tekonsha 118811 T-One Vehicle Wiring Harness, 4-Way Flat |
|---|---|
| Brand | Tekonsha |
| Manufacturer Part Number | 118811 |
| UPC | 016118155266 |
| Product Type | T-Connector |
| Connector Type | 4-Way Flat |
| Installation Position | Vehicle Side |
| Vehicle Compatibility | 2018-2020 Volkswagen Tiguan |
| Circuit Functions | Taillights, Left Turn/Brake, Right Turn/Brake, Ground |
Frequently asked questions
What vehicles does the Tekonsha 118811 fit?
It's a custom-fit harness for the 2018-2020 Volkswagen Tiguan. The connectors are matched to that vehicle's factory wiring, so it isn't a universal kit.
Do I have to cut or splice any wires to install it?
No. The T-One design plugs into your Tiguan's existing wiring using the factory connectors. There's no cutting, splicing, or soldering involved.
What does a 4-way flat connector power?
Four circuits: taillights, left turn and brake, right turn and brake, and a ground. That covers the basic lighting a small trailer needs to be road-legal.
Does this include a trailer brake circuit?
No. A 4-way flat handles lighting only. To run electric trailer brakes you'd need a larger connector, like a 7-way, plus a separate brake controller.
Which side of the connection is this?
This is the vehicle side. It's the harness and connector that stay mounted on your tow vehicle. The trailer carries the matching plug on its own side.
Can I plug a 4-way flat trailer into a 5-way flat?
A 4-way flat and a 5-way flat are different connectors. The 5-way adds one extra pin, usually for a reverse-light or brake-lockout signal, so they aren't directly interchangeable without an adapter. Since the 118811 gives you a 4-way flat, match it to a trailer wired for 4-way flat.
