Tekonsha 118566 T-One ModuLite HD Trailer Connector
Tekonsha 118566 T-One ModuLite HD Trailer Connector — Product description
The Tekonsha 118566 combines a plug-in T-One connector with the Circuit Protected ModuLite HD module, so you can wire your trailer lights without cutting a single factory wire. The powered converter pulls current straight from the battery, protecting your vehicle's electrical system while sending a strong, clean signal to the trailer's 4-way flat plug.
The Tekonsha 118566 pairs a vehicle-specific T-One connector with the Circuit Protected ModuLite HD module, giving you a clean, powered way to wire your trailer lights without touching the factory harness. If you tow anything with lights, brakes, or turn signals, this is the connection that makes it happen.
Here's what sets the T-One connector apart. It plugs straight into your tow vehicle's existing wiring. No cutting, no splicing, no scotch-locks hanging under the bumper. You find the factory connector, unplug it, insert the T-One in line, and plug everything back together. For most installs it's a hand-tools-only job that takes a lot less time than a universal converter.
The real work happens in the ModuLite HD module. It's a powered converter, which means it doesn't try to run your trailer lights through your vehicle's light circuits. Instead it draws current directly from the battery and uses your vehicle's signals only as triggers. That does two things. It keeps your factory wiring protected from the extra load a trailer puts on it, and it delivers a stronger, more consistent signal to the trailer side. If you've ever fought dim trailer lights or blown fuses with a cheap converter, you'll appreciate the difference.
Because it's powered off the battery, this setup plays well with LED trailer lighting and longer wire runs on bigger trailers. And the module is circuit protected, so a short or an overload out at the trailer won't take down your tow vehicle's electrical system. You get a standard 4-way flat output on the trailer end, which covers most utility trailers, small boat trailers, and lightweight campers. Need a bigger plug? Add an adapter and you're set.
One thing to know before you order. T-One connectors are matched to a specific make, model, and year, so fitment matters. If you're not sure this part number is right for your vehicle, send us the year, make, and model and we'll confirm it before you buy. We'd rather get you the right connector the first time.
Key Features
- T-One connector plugs directly into your tow vehicle's existing wiring harness, so there's no cutting or splicing
- Circuit Protected ModuLite HD module is a powered converter that draws current straight from the battery instead of the vehicle's light circuits
- Built-in circuit protection guards your tow vehicle's electrical system against shorts and overloads on the trailer side
- Powered signal handles LED trailer lighting and longer wire runs on larger trailers
- Standard 4-way flat output connects to most utility trailers, small boat trailers, and lightweight campers
- Vehicle-specific fit means a clean factory-style connection with hand tools
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 | T-One Connector With Circuit Protected ModuLite HD Module |
|---|---|
| Brand | Tekonsha |
| Manufacturer Part Number | 118566 |
| UPC | 016118117738 |
| Connector Type | T-One vehicle-specific plug-in |
| Converter Module | Circuit Protected ModuLite HD |
| Installation | Plug-in, no cutting or splicing |
| Circuit Protection | Built-in |
| Power Source | Draws from vehicle battery (powered converter) |
| Trailer Output | 4-way flat |
Frequently asked questions
Do I need to cut or splice any wires to install this?
No. The T-One connector plugs into the factory wiring harness on your tow vehicle. It's a plug-in connection, so your original wiring stays intact.
What does the ModuLite HD module actually do?
It's a powered converter. Instead of pulling current through your vehicle's light circuits, it draws power directly from the battery to run the trailer lights. That protects your factory wiring and gives the trailer side a stronger, cleaner signal.
Will this work with LED trailer lights?
Yes. Because the ModuLite HD is a powered converter drawing from the battery, it handles LED trailer lighting well, where an unpowered converter can leave LEDs dim or flickering.
What kind of trailer connector does this give me?
A standard 4-way flat connector, which fits most small utility trailers, boat trailers, and lightweight campers. If your trailer uses a larger plug, you can add an adapter to step up.
Is there circuit protection built in?
Yes. The module is circuit protected, so a short or overload on the trailer wiring won't damage your tow vehicle's electrical system.
How do I know this fits my vehicle?
T-One connectors are vehicle-specific, matched to a particular make, model, and year range. Send us your year, make, and model and we'll confirm this part number is right before you buy.
