CURT 4-Pin Round Trailer Wiring Connector Kit - 58671 Die-Cast Metal, Weather-Resistant 4-Way

CURT 58671 is a vehicle-side and trailer-side 4-pin round wiring connector kit that delivers a weather-resistant, die-cast metal plug and socket for tail lights, turn signals, brake lights and ground connection.

When towing, a dependable electrical link between your vehicle and trailer is essential for safety and legal road use. The CURT 58671 set provides both the male plug and female socket built to industry 4-way round standards. Its compact die-cast metal housings, concealed terminals and spring-loaded cover help protect connections from moisture, dirt and vibration so your lighting circuits remain functional trip after trip.

How does the CURT 58671 keep trailer lights working reliably?

Reliable lighting starts with secure contact and protection from the elements. This kit uses concealed terminals and a spring-loaded steel cover to reduce exposure to water, salt and debris while locking tabs hold the plug in place through bumps and movement.

• Concealed terminals reduce corrosion risk and extend connection life
• Locking tabs secure plug to socket under vibration
• Spring-loaded cover shields contacts when disconnected
• Die-cast metal housing resists impact and deformation

Will this connector match my trailer and vehicle wiring?

The CURT 58671 follows the industry-standard 4-way round wiring format, making it compatible with most older and utility trailers that use the round 4-pin configuration. It provides the standard circuits for tail, stop, left/right turn and ground.

• Fits industry-standard 4-pin round receptacles
• Includes both male plug (trailer) and female socket (vehicle)
• Designed for common trailer light wiring schemes
• Ideal as a replacement for worn or damaged round 4-pin connectors

How does installation and everyday use feel?

CURT designed the plug with ergonomic tabs for an easier grip, making insertion and removal straightforward even in tight or low-light conditions. The connectors are built to be plug-and-play with standard wiring splices, though wires are not included in the kit.

• Ergonomic tabs improve handhold when connecting or disconnecting
• Plug-and-play form factor for simple replacement installs
• Concealed terminal design still allows standard wire splice access
• Durable finish withstands routine handling and road grime

What environmental challenges can this connector withstand?

This connector set is engineered to resist the common environmental threats that degrade trailer wiring—rain, road spray, salt and dust. The robust metal housing and internal protection lower maintenance needs and help keep electrical contact reliable over time.

• Die-cast metal housing resists corrosion and physical damage
• Terminals tucked away to minimize exposure to moisture and salt
• Spring steel cover prevents direct contact when idle
• Locking mechanism keeps pins aligned despite road vibration

Who this is for: The CURT 58671 4-pin round wiring connectors are suited for drivers who tow small to medium trailers—utility trailers, boat trailers, vintage trailers and many light-duty setups—that use the 4-way round standard. It’s a good pick for owners replacing worn connectors, upgrading to a more durable metal housing, or anyone who wants a dependable, easy-grip plug and socket pair to maintain trailer lighting and safety on the road.