4Way Trailer Circuit Tester – Reliable, EasytoUse Electrical Diagnostic Tool Ensure your trailer lights and wiring are functioning properly with this compact and efficient 4way trailer circuit tester. Designed for quick diagnostics without the need for extra tools or batteries, it provides a clear, immediate indication of your vehicle's trailer wiring status. Key Features and Benefits: Function: Checks the correct operation of your vehicle's 4pin flat trailer wiring harness, helping you quickly identify and troubleshoot trailer light issues. Compatibility: Works with standard 4pin flat trailer connectors found on most cars, trucks, SUVs, and towing vehicles. Compact Design: Small size makes it easy to store in a glove box, car door pocket, or toolbox, ensuring it is always on hand when needed. Clear LED Indicators: Builtin LED lights show the status of each circuit, allowing you to instantly identify which lights are working and which are not. Simple Operation: Just plug the tester into the 4pin flat connector and observe the LEDs. If all lights illuminate, your circuits are functioning correctly. Durable Construction: Made from tough ABS plastic for longlasting use, with strong resistance to rust and wear. Terminal Protection: Equipped with a dustproof rubber sleeve to shield the terminals when not in use, extending the life of the tester. Practical Applications: 1. PreTrip Safety Check – Verify that all trailer lights are working before a long journey, preventing potential fines or safety hazards. 2. Troubleshooting – Quickly pinpoint wiring problems whether at home, in the workshop, or on the road, saving time and costs. 3. Seasonal Use – Ideal for checking trailer wiring before hauling boats, campers, or utility trailers during seasonal activities. With its portable design, ease of use, and clear LED feedback, this 4way trailer circuit tester is an essential tool for any driver who tows a trailer. It provides fast, reliable, and convenient testing of lighting circuits, ensuring safety and compliance every time you tow.