- CUSTOM-FIT EXTENSION: This 7-way blade trailer connector integrates seamlessly with your OEM wiring harness, providing a dedicated socket in your truck bed for fifth wheels. The 7-foot wire harness offers versatile mounting options for your convenience. - EASY TO INSTALL: Install your 7-way blade socket effortlessly with this custom harness. A 2-1/8-inch hole saw is needed for installation, and the T-connector connects directly to your truck's factory wiring—no cutting, splicing, or tapping required. - RELIABLE CONNECTION: Our OEM wiring harness features a 7-pin truck socket that connects your trailer's taillights, brake lights, reverse lights, turn signals, electric trailer brakes, and an auxiliary power wire, ensuring a straightforward installation process. - DURABLE CONSTRUCTION: Designed for long-lasting performance, this harness includes a spring-loaded lid for the 7-way blade to keep the socket protected when not in use. It is also equipped with a black sealed tubing wire conduit to safeguard against wear, damage, and weather-related issues. Use Scenarios: 1. Suitable for connecting fifth wheel trailers, ensuring you have all necessary lights and brakes functional during transport. 2. Ideal for RV enthusiasts who require a reliable power source for additional accessories while parked or on the road. 3. Perfect for businesses that utilize heavy-duty trailers for transport, providing a dependable connection for essential lighting and braking systems.