Tekonsha 118675 T-One ModuLite Trailer Wiring Harness
Tekonsha 118675 T-One ModuLite Trailer Wiring Harness — Product description
The Tekonsha 118675 is a T-One connector paired with an upgraded, circuit-protected ModuLite module. It plugs into your tow vehicle's factory harness, then powers the trailer lights straight off the battery through a converter that keeps your vehicle's circuits protected. Rated for 4.2 amps on stop and turn, 7.5 amps on taillights.
Wiring a trailer to your tow vehicle should be a plug-in job, not a splice-and-pray afternoon under the dash. That's the whole idea behind the Tekonsha 118675. It's a T-One connector assembly, which means it plugs into a vehicle-specific harness connector already built into your tow vehicle, no cutting into the factory wiring. Paired with it is an upgraded, circuit-protected ModuLite module that does the real work of powering your trailer lights.
Here's why the ModuLite matters. A basic wiring kit just borrows the small signals running to your vehicle's tail, brake, and turn lights. Add a loaded trailer and that can overload circuits the automaker never sized for the extra draw. The ModuLite is a powered converter. Instead of pulling everything through the vehicle's light circuits, it draws power directly from the battery and uses the vehicle's signals only to tell it when to switch. Your trailer lights get clean, full power, and the factory circuits stay protected. That's what the circuit-protected part of the name is about.
The module is rated at 4.2 amps on the combined stop and turn circuit and 7.5 amps on the taillight circuit. That's plenty of headroom for a standard boat, utility, or travel trailer running incandescent or LED marker and stop lights. It outputs a standard 4-way flat connector, the most common trailer plug on light-duty trailers, so most trailers hook right up.
Installation is about as clean as trailer wiring gets. The T-One harness plugs into your vehicle's existing connector, the ModuLite mounts nearby, and you run a single power lead to the battery. No test light, no scotch-locks, no guessing which wire is the left turn signal. Just remember that T-One harnesses are vehicle-specific, so confirm the 118675 part number matches your exact year, make, and model before you install. Different vehicles use different connectors.
If you tow a boat trailer down to the ramp and back, or pull a utility trailer on weekends, this is the kind of setup you wire in once and forget about. Because the module carries the load instead of your vehicle's wiring, you're not going to pop a fuse the first time you hit the brakes with a full trailer behind you.
Key Features
- T-One connector assembly plugs into your tow vehicle's factory harness connector, so there's no cutting or splicing into original wiring
- Upgraded circuit-protected ModuLite module draws trailer-light power directly from the battery, keeping your vehicle's factory circuits protected from overload
- Rated 4.2 amps on the combined stop and turn circuit for reliable brake and signal output with a loaded trailer
- Rated 7.5 amps on the taillight circuit to run marker and running lights without overloading vehicle wiring
- Standard 4-way flat output connects to the most common light-duty trailer plug
- Powered converter design means the module carries the load, not your vehicle's light circuits
- Vehicle-specific T-One fit for a clean, factory-style installation
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 Module; 4.2 Amp Stop/Turn and 7.5 Amp Taillights |
|---|---|
| Brand | Tekonsha |
| Manufacturer Part Number | 118675 |
| UPC | 016118134414 |
| Connector Type | T-One Connector Assembly |
| Converter Module | Circuit Protected ModuLite |
| Stop/Turn Circuit Rating | 4.2 Amps |
| Taillight Circuit Rating | 7.5 Amps |
| Output Connector | 4-Way Flat |
| Power Source | Direct battery connection (powered converter) |
| Fit Type | Vehicle-Specific |
Frequently asked questions
Does the 118675 fit my vehicle?
The T-One connector is vehicle-specific, so it only fits the year, make, and model it's designed for. Confirm the 118675 part number against your exact vehicle before installing. If it matches, it plugs right into the factory connector with no splicing.
What is the ModuLite module and why does it matter?
It's a powered converter. Instead of running trailer lights off your vehicle's small light-circuit signals, it draws power straight from the battery and uses the vehicle signals only to switch the lights. That protects your factory circuits from the extra load a trailer adds.
What are the amp ratings?
The module handles 4.2 amps on the combined stop and turn circuit and 7.5 amps on the taillight circuit. That covers standard boat, utility, and travel trailers running marker and stop lights.
What kind of trailer plug does it use?
It outputs a standard 4-way flat connector, the most common plug on light-duty trailers, so most trailers hook straight up.
Do I need to connect it to the battery?
Yes. Because it's a powered converter, you run a single power lead from the module to the vehicle battery. That's what lets it carry the trailer-light load instead of your vehicle's wiring.
Is this hard to install?
Not really. The T-One harness plugs into your vehicle's existing connector, you mount the module nearby, and you run one wire to the battery. No test light or splicing into factory wires needed.
