This 4 Pin 5 Wire Trailer Wiring Harness is a versatile and essential accessory for safely rewiring your trailer's both-side taillights. Measuring 22 feet (6.7 meters) in length, it provides ample cable to accommodate most trailer setups. The harness features a 4-way flat trailer circuit tester, allowing you to easily diagnose and troubleshoot any electrical issues before hitting the road. Compatible with a wide range of voltages from 12V to 120V, this wiring harness is designed to withstand the rigors of towing, ensuring a secure and reliable connection. Whether you're hauling a utility trailer, boat, or RV, this harness offers the peace of mind that your trailer's lighting system is functioning correctly, enhancing visibility and safety on the roads.