Yinaolan Trailer Wiring Connector 7-Blade + 4-Flat with Mounting Bracket — Plug-and-Play, Weather-Resistant

The Yinaolan OE style 7-blade and 4-flat trailer wiring connector is a plug-and-play replacement kit that combines a 7-pin blade and 4-flat socket with a mounting bracket for secure, weather-resistant towing connections.

Designed as a direct-fit substitute for several factory OEM trailers and truck models, this wiring connector kit gives you both 7-pin and 4-flat options in one compact unit. It arrives with a flip cover for protection, a mounting bracket and screws for quick installation, and built-in dust seals to keep terminals dry and reliable in outdoor conditions.

Which vehicles and harnesses is this connector compatible with?

This Yinaolan connector is engineered to match OE-style fittings commonly found on full-size trucks and many light-duty trailers. It replaces specific factory part numbers and fits a broad list of makes and models without the need for extensive rewiring.

• Direct-fit replacement for part numbers like fu5z-14489-a and 9u5z-14489-maa
• Compatible with Ford F-Series (F-150, F-250, F-350, F-450) and many Ranger models
• Works with GM trucks (Chevrolet Silverado, Colorado, Suburban, Tahoe) and GMC models
• Also suitable for Dodge Ram, Honda, Jeep, Nissan, Lincoln, Toyota and other vehicles that use OE-style 7-blade and 4-flat connections

How straightforward is installation and what hardware is included?

The kit is built for simple plug-in replacement: remove the old socket, attach the new connector, and secure it using the supplied bracket and screws. No special tools or complex splicing are necessary when replacing a matching OE-style plug.

• Includes one 40974 multi-tow 7-blade + 4-flat connector
• Comes with a dedicated mounting bracket and two screws for secure attachment
• Flip cover provides a sealed closure to reduce exposure while unplugged
• Designed to align with existing vehicle wiring harness locations for quick swap-out

What protection does this connector offer against weather and corrosion?

Yinaolan designed the connector with spring-loaded dust covers and a flip-top seal to keep moisture, dirt and debris away from the terminals. These features reduce the risk of corrosion and intermittent connections that can interfere with trailer lighting and brakes.

• Flip cover creates a tight barrier when not in use
• Spring dust covers shield each terminal from contaminants
• Durable housing material resists outdoor wear and abrasion
• Compact design limits ingress points, prolonging electrical reliability

What should I expect from the product support and warranty?

Yinaolan backs the connector with a one-year warranty and customer support intended to resolve issues quickly. If you encounter fitment problems or defects, contact their support team for assistance and options for replacement or refund.

• One-year limited warranty provided by the manufacturer
• Customer support available for fitment questions and troubleshooting
• Replacement or repair options if defects are verified
• Quick response commitment for post-sale inquiries

Who is this for: This wiring connector kit is best for vehicle owners, fleet managers, and RV or trailer enthusiasts who need a reliable, OEM-style replacement for worn or damaged trailer plugs. It suits anyone seeking a plug-and-play solution that restores both 7-pin and 4-flat functionality without complex wiring, while offering weather protection and a secure mounting option.