Oyviny 4-Way Flat Trailer Wiring Tester 4 Pin Male and Female Trailer Tester with Bright Indicators, Double End Design 4 Pin Trailer Light Tester for Turn Signal Tail Lights Trouble Shooter

4 Way Trailer Tester: Using this 4 pin trailer plug tester to confirm proper function of your vehicle’s trailer wiring harness, excellent for diagnosing trailer light issues, lets you know where in the system there is a problem instead of guessing; It also acts as a standard 4-Pin male and female trailer connector to connect standard 4-pin trailer wire. Plug and Play: This 4 pin trailer plug tester is easy to use, just plug the tester into the 4 pin flat trailer connector on your tow vehicle and trailer to test taillights and turn signals for proper operation. Bright LED Indicators: This 4-way trailer circuit tester features a LED light for each electrical functions, turn on the lights and check, you can easily read the LEDs and find out which wiring has a problem. Durable Construction: 4 pin trailer socket tester is made from durable ABS plastic, which will never rust or corrode; Tin-Plated copper terminals makes great conductivity; Female end tester comes with a rubber dust cover to protect the terminals when not in use. Compact Design: Small size trailer plug tester is convenient for storage, allows you store in your tool box, glove compartment or anywhere to be ready when you need it; Take this tester to be your assistant when needed wherever you go