Easily diagnose electrical issues by testing tail lights, turn signals, brake lights, and ground connections. This durable tester plugs directly into your 4-way flat socket to provide real-time feedback on vehicle-side wiring functionality.

• 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 visual feedback
• Durable plastic construction for reliable field use