Tekonsha 118816 T-One ModuLite HD Tow Harness
Tekonsha 118816 T-One ModuLite HD Tow Harness — Product description
The Tekonsha 118816 pairs a plug-in T-One connector with the upgraded, circuit protected ModuLite HD module, so wiring your trailer lights doesn't mean cutting into the factory harness. It draws power straight from the battery for full, steady output, and it's built to fit one specific vehicle. Check part 118816 against your year, make, and model before you order.
The Tekonsha 118816 is a T-One connector assembly paired with the upgraded circuit protected ModuLite HD module. If you're setting up to tow a trailer and you want the wiring done right the first time, this is the kind of harness that saves you a Saturday under the dash with a test light and a roll of tape.
Here's how it works. The T-One side is a plug-in connector built to match a specific vehicle's factory tail light harness. You unplug the factory connectors, slot the T-One in between, and plug the factory side back in. No cutting, no splicing, no scotch locks biting into wires that'll corrode two seasons from now. It's clean, and it comes back out just as clean if you ever sell the vehicle.
The ModuLite HD module is where the upgrade earns its keep. Instead of pulling the current for your trailer lights through the vehicle's own light circuits, it draws power straight from the battery and uses the vehicle signals only to switch. That means your trailer's running lights, turn signals, and brake lights get full, steady power without loading down the tow vehicle's circuits or tripping a bulb-out warning. The circuit protected part matters too. The module has self-resetting protection built in, so a momentary short from a wet connector or a pinched trailer wire won't cook it. It backs off, then comes right back once the fault clears.
This is towing gear, not marine wiring, so think trailers, campers, and utility haulers rather than anything that lives in the water. One thing to get right before you order: the T-One connector is vehicle-specific. Part 118816 fits a particular set of years, makes, and models, so check your vehicle against Tekonsha's fitment listing for this part number before you buy. Get the right one and it's a twenty-minute job. Get the wrong one and nothing plugs in. If you're not sure this is the match for your truck or SUV, send us the year, make, and model and we'll confirm it before you order.
Key Features
- T-One plug-in connector matches the vehicle's factory tail light harness, so install needs no cutting or splicing
- Upgraded ModuLite HD module draws power directly from the battery for full, steady trailer light output
- Self-resetting circuit protection guards the module against shorts from wet or pinched trailer wiring
- Powers trailer running lights, turn signals, and brake lights without loading the tow vehicle's circuits
- 4-Way Flat trailer-side output, the standard connection for most light-duty trailers and campers
- Vehicle-specific fit for part number 118816, and it comes back out cleanly if you sell 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 | 118816 |
| UPC | 016118156300 |
| Keystone Part Number | T1M118816 |
| Converter Module | Circuit Protected ModuLite HD |
| Connector Type | T-One vehicle-specific plug-in |
| Circuit Protection | Self-resetting |
| Power Source | Direct vehicle battery connection |
| Installation | Plug-in, no cutting or splicing |
| Trailer-Side Output | 4-Way Flat |
| Application | Trailer, camper, and utility trailer towing |
Frequently asked questions
Do I have to cut or splice any wires to install this?
No. The T-One side plugs into your vehicle's factory tail light connectors. You unplug the factory harness, slot the T-One in between, and plug it back in. No cutting, no scotch locks, no taping.
What does the ModuLite HD module actually do?
It's a powered converter. Instead of running your trailer lights off the vehicle's own light circuits, it pulls power straight from the battery and uses the vehicle signals only to switch. That gives your trailer full, steady power and keeps the tow vehicle from throwing a bulb-out warning.
What does 'circuit protected' mean here?
The module has self-resetting protection built in. If a wet connector or a pinched trailer wire causes a momentary short, the module backs off instead of frying, then comes back once the fault clears.
Will this fit my vehicle?
Part 118816 is vehicle-specific and fits a set list of years, makes, and models. Check your vehicle against Tekonsha's fitment listing for this part number before ordering. If you're not sure, send us your year, make, and model and we'll confirm it first.
Is this for a boat or a trailer?
It's towing gear, not marine wiring. Think trailers, campers, and utility haulers pulled behind a truck or SUV, not anything that goes in the water.
What kind of trailer plug does it give me?
It provides a 4-Way Flat connection on the trailer side, which covers running lights, left and right turn and brake, and ground. That's the standard connector for most light-duty trailers.
