Tekonsha 118571 T-One Connector w/ ModuLite HD
Tekonsha 118571 T-One Connector w/ ModuLite HD — Product description
The Tekonsha 118571 pairs a plug-in T-One connector with an upgraded, circuit-protected ModuLite HD module. It wires your tow vehicle to your trailer with no cutting or splicing, drawing power straight from the battery for strong, steady 4-way flat trailer lights.
The Tekonsha 118571 is a T-One connector assembly paired with an upgraded, circuit-protected ModuLite HD module. In plain terms, it's a custom plug-in wiring harness that gets your tow vehicle talking to your trailer without cutting or splicing a single factory wire.
Here's how it works. The T-One side plugs straight into your vehicle's existing wiring using the connectors the manufacturer already put there. No test light, no splice taps, no guesswork. From there the ModuLite HD module takes over the electrical heavy lifting. It draws power directly from the battery instead of pulling it through your vehicle's light-duty wiring, so your trailer lights get a strong, steady feed and your factory circuits stay protected.
That circuit-protected part matters. Trailer wiring is one of those jobs where a dead short or an overloaded circuit can blow a fuse you didn't know existed, sometimes taking a control module with it. The ModuLite HD isolates the trailer side and guards against that, which is exactly what you want when you're backing a loaded boat trailer down a wet ramp at dawn.
The output is a standard 4-way flat connector, the most common trailer plug on small boat trailers, utility trailers, and pop-ups. If your trailer runs running lights, brake lights, and turn signals off a 4-way, this is a clean match. The powered converter design also plays nice with both LED and incandescent trailer bulbs, so you're not chasing hyper-flash or dim lights after the swap.
This is a vehicle-specific harness, so it's built to drop into a particular application. Check that the 118571 is listed for your year, make, and model before you order. Once it's the right fit, install is genuinely a plug-and-play afternoon job, no wiring diagram required.
Honest take? If you tow a boat, a utility trailer, or a camper and you've been limping along with a splice-in converter, this is the upgrade that makes the whole hookup feel factory. Reliable lights, protected wiring, and a connection you can trust every time you hitch up.
Key Features
- T-One plug-in design connects to your vehicle's factory wiring with no cutting or splicing
- Circuit-protected ModuLite HD module draws power straight from the battery to guard factory circuits
- Standard 4-way flat output matches most small boat, utility, and pop-up trailers
- Powered converter works with both LED and incandescent trailer bulbs
- Vehicle-specific fit for a clean, hidden, factory-style installation
- Upgraded HD module handles the added electrical load of trailer lighting
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 | 118571 |
| UPC | 016118118834 |
| Connector Type | T-One plug-in harness |
| Connector Output | 4-Way Flat |
| Converter Module | Upgraded ModuLite HD |
| Circuit Protection | Circuit-protected |
| Power Source | Draws from vehicle battery (powered converter) |
| Bulb Compatibility | LED and incandescent |
Frequently asked questions
What does the ModuLite HD module do?
It's a powered converter. It pulls power directly from your vehicle's battery to run the trailer lights instead of drawing it through the factory wiring. That protects your vehicle's circuits and gives the trailer a stronger, steadier signal.
Is this a 4-way or 7-way connector?
The 118571 outputs a standard 4-way flat connector, which covers running lights, brake lights, and turn signals. It's the most common plug on small boat and utility trailers.
Do I have to cut or splice any wires?
No. The T-One side plugs directly into your vehicle's existing factory connectors. It's a plug-in install with no splicing or test light needed.
Will it work with LED trailer lights?
Yes. The powered ModuLite HD converter handles both LED and incandescent bulbs, so you won't get hyper-flash or dim lights after the swap.
How do I know it fits my vehicle?
This is a vehicle-specific harness. Confirm that part number 118571 is listed for your exact year, make, and model before ordering.
What does circuit protected mean here?
The module guards the trailer wiring against shorts and overloads, isolating the trailer side so a problem at the plug doesn't damage your vehicle's electrical system.
