Plug this easy-to-use trailer light tester into your tow vehicle and the LEDs light up if the wiring is working correctly for quick and easy results. The light tester fits four-way flat plugs and a small, convenient size allows it to fit easily in your glove compartment or pocket. Test your right, left, tail and brake light wiring all with one handy light tester!

• Fits four-way flat plugs
• Male and female brass connectors
• Tests right, left, tail, and brake light wiring
• Small size fits easily in glove compartment or pocket