Easily diagnose electrical issues or verify new custom wiring harnesses with this CURT 4-way flat connector tester. This tool plugs directly into your vehicle's socket to test tail lights, turn signals, brake lights, and ground connections using responsive LED indicators.

• Confirms proper function of vehicle-side wiring connectors
• Tests 4-way flat connections for tail lights, brake lights, and turn signals
• Equipped with long-lasting LED lights for clear signal response
• Durable plastic construction for reliable use