Oyviny 2-to-3-Wire Tail Light Converter, Splice-In Solid-State Adapter for Trailers with Pre-Stripped Color-Coded Leads

If you're towing an older trailer, dinghy, or RV that uses a combined two-wire taillight setup, this compact Oyviny adapter provides a reliable way to split signals into dedicated turn and brake circuits. The unit splices into existing wiring or to a 4-way flat socket and uses color-coded, pre-stripped leads for quicker installation. Built from durable ABS thermoplastic, the converter is designed for long-term service without adding an external flasher or battery taps.

How does this converter separate brake and turn lights?

The converter receives the combined two-wire input and electronically splits it into three distinct outputs so your trailer’s brake and turn lamps respond independently. It uses solid-state circuitry to interpret signal differences and route power accordingly without mechanical relays.

• Accepts a 2-wire vehicle tail-light feed and produces standard 3-wire trailer outputs
• Solid-state electronics separate brake vs. turn functions automatically
• Color-coded wiring reduces installation errors
• No additional flasher relay or battery connection is required

What vehicle and trailer setups is this compatible with?

This splice-in adapter targets vehicles and towed units that use a combined taillight circuit—commonly older cars, dinghies, and some RV setups. It works well with pickup trucks, vans, and trailers that accept a 3-wire input from a tow vehicle once converted.

• Designed for trailers, RVs, dinghies and older tow vehicles with 2-wire outputs
• Can be spliced into trailer wiring or connected at a 4-way flat socket
• Not suitable for vehicles that already use multiplex or low-side switching systems
• Does not convert a 3-wire vehicle to a 2-wire towed vehicle

How simple is the installation and what materials come with the unit?

Installation is straightforward for anyone familiar with basic trailer wiring: the converter arrives with pre-stripped, color-coded leads and labeled functions to help you match vehicle wires quickly. The package includes wire taps for direct splicing so you can avoid cutting long harness sections.

• Pre-stripped and color-coded wires labeled by function for fast hookups
• Includes wire taps for splicing into existing harnesses without soldering
• Compact ABS housing resists road vibration and weather exposure
• Use basic tools (wire crimper, electrical tape or heat-shrink) to secure connections

Are there any limitations or special warnings to know before buying?

There are a few compatibility and function notes to consider: this model does not support tailgate or cargo box lighting, and the solid-state design won’t function properly with some modern low-side switch or multiplex electrical systems. It also cannot be reversed to turn a three-wire vehicle into a two-wire trailer.

• Not compatible with low-side switch or multiplexed vehicle lighting systems
• Tailgate light functions are not supported by this converter
• Cannot be used in reverse to convert 3-wire vehicle outputs to 2-wire
• Test connections after installation to confirm proper signal separation

Who is this for: The Oyviny 2-to-3-wire tail light converter is aimed at DIY tow-vehicle owners, small-fleet operators, and RV or dinghy enthusiasts who need a dependable, non-invasive way to convert older two-wire tail-light outputs into a modern three-wire trailer circuit. If you want a compact, durable splice-in adapter with clear labeling and included wire taps, this offers a practical solution—provided your vehicle electrical system is of the compatible type.