Tekonsha 118817 T-One ModuLite HD Wiring Connector
Tekonsha 118817 T-One ModuLite HD Wiring Connector — Product description
The Tekonsha 118817 pairs a T-One connector assembly with an upgraded, circuit-protected ModuLite HD module. It plugs into your tow vehicle's existing wiring and pulls trailer power straight off the battery, so your tow rig's lighting circuits stay protected. A clean, no-splice way to wire up for towing.
The Tekonsha 118817 is a T-One connector assembly matched with an upgraded, circuit-protected ModuLite HD module. If you've ever dreaded cutting into a factory wiring harness to add trailer lights, this is the setup that skips all of that. The T-One side plugs straight into your tow vehicle's existing wiring, and the ModuLite HD module handles the conversion and protection so your trailer's lights fire the way they should.
Here's the part RV and boat-trailer owners care about. A T-One connector is designed to be a plug-in job. You find the vehicle's existing connector under the dash or behind a panel, plug this harness in line, and you're done. No splicing, no cutting, no crimp taps biting into wires that were never meant to be touched. That keeps your factory wiring intact and makes the whole install something you can knock out in your driveway.
The ModuLite HD module is where the HD earns its name. Instead of pulling the extra current your trailer lights need through the tow vehicle's own light circuits, the module draws power directly from the battery. Your vehicle's wiring only sends the signal. That means the truck or SUV's turn, brake, and tail circuits don't get overloaded when you hook up a loaded trailer. And because this version is circuit protected, a short or an overload at the trailer won't feed back and cook something expensive up front.
This assembly is a solid pick for anyone towing a boat trailer, utility trailer, or small camper who wants a factory-clean connection at the back of the vehicle. It's the kind of gear we'd rig up ourselves before a season of hauling. You get a proper connector at the rear, the module doing the heavy lifting on power and protection, and none of the guesswork that comes with splicing into modern vehicle wiring.
One note on fitment. T-One harnesses are vehicle-specific, so confirm this part number matches your exact year, make, and model before you install it. If you're not sure, reach out and we'll help you check.
Key Features
- T-One plug-in connector: connects to the tow vehicle's existing wiring for a no-splice, no-cut install
- Circuit-protected ModuLite HD module: guards the tow vehicle's wiring against shorts and overloads coming from the trailer
- Power drawn from the battery: the module feeds trailer lights directly so the vehicle's own light circuits aren't overloaded
- Vehicle-specific fit: designed to match a defined year, make, and model for a factory-clean connection
- Upgraded HD module: built to handle heavier trailer lighting loads than a basic converter
- Rear trailer connector output: gives you a ready connection point at the back of the vehicle
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 Assembly With Upgraded Circuit Protected Modulite HD Module |
|---|---|
| Brand | Tekonsha |
| Manufacturer Part Number | 118817 |
| UPC | 016118156676 |
| Keystone Part Number | T1M118817 |
| Module | Circuit Protected ModuLite HD |
| Connector Style | T-One |
| Assembly Type | Tow Harness T-Connector Assembly |
Frequently asked questions
Do I need to cut or splice into my vehicle's wiring to install the 118817?
No. The T-One side is a plug-in connector. It's designed to connect to your tow vehicle's existing wiring, so a typical install means plugging it in line without cutting or splicing the factory harness.
What does the ModuLite HD module actually do?
It's a circuit-protected converter module. It takes the signal from your vehicle's wiring and pulls the power your trailer lights need directly from the battery, which keeps the tow vehicle's own light circuits from being overloaded.
Why does circuit protected matter?
Circuit protection means a short or an overload at the trailer end won't feed straight back into your tow vehicle's electrical system. It's cheap insurance against an expensive repair up front.
Will this fit my truck or SUV?
T-One harnesses are vehicle-specific, so this part number is built for a particular year, make, and model. Confirm the fitment against your exact vehicle before installing, and reach out if you'd like us to help check.
What's included?
This is the T-One connector assembly paired with the upgraded circuit-protected ModuLite HD module. You get the vehicle-side harness and the converter module in one assembly.
