Oyviny 2-to-3-Wire Splice-In Trailer Tail Light Converter, Pre-Stripped Leads & Solid-State Brake/Turn Separation

The Oyviny 2-to-3-Wire Splice-in Trailer Tail Light Converter lets you change a vehicle's 2-wire taillight wiring into a standard 3-wire system, separating turn and brake circuits for compatible trailers and dinghies.

This compact splice-in adapter is built for tow vehicles and towed rigs that use a 2-wire lighting circuit and require a 3-wire trailer harness. Crafted from durable ABS thermoplastic and supplied with pre-stripped, color-coded leads and wire taps, the converter is intended to simplify installation without the need for a heavy-duty flasher or extra battery connections. It’s a practical electrical solution for pickup trucks, vans, RVs, and dinghy-towed vehicles when converting tail light signals for trailers or tow-behind campers.

How does this converter separate brake and turn signals?

The Oyviny unit uses solid-state circuitry to detect combined stop/turn signals on a 2-wire vehicle and produce distinct outputs for the trailer’s brake and turn lamps. It splices directly into the vehicle tail light wiring or to a 4-way flat socket, routing the proper voltage to the separate trailer circuits.

• Splits single combined stop/turn feed into separate brake and turn outputs
• Pre-stripped, color-coded wires speed up correct connections
• Includes wire taps for direct splicing to existing harnesses

What vehicles and trailers are compatible with this adapter?

This converter is designed for 2-wire vehicle electrical systems typically found on older or simpler tow vehicles and for trailers requiring a 3-wire input. It works well with pickup trucks, vans, RVs, dinghy-towed cars and many trailers — but is not suitable for multiplex systems or low-side switched circuits.

• Compatible: 2-wire vehicle lighting systems, standard 3-wire trailer harnesses
• Recommended for: trailers, RVs, dinghy towing, small camper conversions
• Not compatible with: multiplexed/low-side switch electronics or converting 3-wire vehicles into 2-wire towed rigs

How difficult is installation and what tools are needed?

Installation is typically straightforward for anyone comfortable with basic automotive wiring. The converter includes color-coded, pre-stripped leads and wire taps so you can splice into existing wires; no heavy-duty flasher or external battery connection is required.

• Tools: wire crimper, cutters, electrical tape or heat-shrink, basic hand tools
• Connectors: wire taps supplied for direct splicing or attach to a 4-way flat socket
• Estimated time: 15–45 minutes depending on access and wiring complexity

What limitations or precautions should I know about?

The Oyviny converter uses solid-state components and is not compatible with low-side switch outputs, multiplexed lighting systems, or tailgate light functions. It cannot be used in reverse to convert a 3-wire tow vehicle into a 2-wire towed vehicle.

• Does not support tailgate lighting functions
• Not suitable for vehicles with multiplex/low-side switching circuits
• Ensure correct wire identification before splicing to avoid malfunction

Who is this for: The Oyviny 2-to-3-Wire Splice-in Trailer Tail Light Converter is aimed at DIY mechanics, trailer owners, RV enthusiasts, and anyone towing a dinghy or utility trailer who needs a reliable way to split combined brake/turn signals into a standard 3-wire trailer harness. If you want a compact, splice-in adapter with clear color-coded wiring and wire taps for a quick retrofit — and your vehicle uses a conventional 2-wire lighting circuit — this converter is a practical option. For advanced vehicle electrical systems, multiplexed lighting, or low-side switching, consult a professional before purchase.