CURT 58240 3-to-2 Wire Tail Light Converter (Interior Mount) for Incandescent Systems, Non-Powered Splice-In

The CURT 58240 is a non-powered splice-in converter that changes a vehicle's 3-wire tail light system to a 2-wire trailer output for safe, compliant towing (not compatible with LED lighting).

When your vehicle lacks a factory trailer connector, the CURT 58240 offers a straightforward electrical solution. Instead of plugging into preexisting sockets, this taillight converter splices directly into your vehicle's taillight wiring to create a simple 2-wire trailer circuit. It arrives ready to install with blunt-cut, color-coded leads and is built for interior mounting on vehicles that use conventional incandescent lighting.

How does the CURT 58240 convert my vehicle's wiring for towing?

This unit takes the three separate vehicle tail light signals and merges them into a two-wire trailer output so a trailer's lights operate correctly with your vehicle's incandescent system. It performs the conversion passively (non-powered), relying on the vehicle's existing circuits without extra fuses or battery connections.

• Converts 3-wire vehicle harness to 2-wire trailer output
• Non-powered design—no direct battery hookup required
• Handles separate taillight and signal circuits at specified amp ratings

What is required to install this splice-in taillight converter?

Installation involves splicing the blunt-cut, color-coded wires from the CURT 58240 into your vehicle's taillight wiring inside the vehicle body. It must be mounted in the interior and is intended for users comfortable with basic wire splicing and securing a small module out of the elements.

• Requires basic wiring tools and splice connectors or solder and shrink tubing
• Mount the converter inside the vehicle to protect it from moisture and debris
• No heavy-duty flasher or additional battery connection needed

Which vehicles and lighting systems are compatible with this converter?

The CURT 58240 is compatible with vehicles that use traditional incandescent taillights and have a three-wire taillight circuit. It is not suitable for vehicles that use LED lighting or for systems that require powered converters to meet higher current demands.

• Works with most incandescent taillight systems featuring three wires
• Not compatible with LED taillights or bulbs
• Can be spliced to a 4-way flat socket when a physical trailer connector is needed

How reliable and durable is this splice-in converter for regular towing?

Built by CURT with color-coded wiring and rated circuit capacities, the 58240 offers a dependable long-term splice-in option when a vehicle-specific custom harness isn't available. Because it sits inside the vehicle and avoids exposure to road conditions, it provides stable electrical connections when installed correctly.

• Color-coded wires simplify correct splicing and reduce installation errors
• Interior mounting prolongs component life by avoiding moisture and road salt
• Rated for signal and taillight circuits (2.1 amps for signal, 5.0 amps for taillight)

Who is this for: The CURT 58240 is aimed at DIYers, RV owners who dinghy tow, and anyone needing a simple splice-in trailer lighting solution for vehicles with incandescent taillights. Choose this converter if you want a ready-to-install, interior-mounted unit that converts a 3-wire system to a 2-wire trailer output and you do not have or cannot source a vehicle-specific custom harness. Avoid it if your vehicle uses LED lighting or if you require an externally mounted, powered converter for higher-current applications.