JAMHER 4-Way Male and Female Flat Trailer Wiring Tester Double End Design 4 Pin Trailer Light Tester with Bright Indicators

Role:Making sure your trailer lights are working properly.
Whether you have just installed a new vehicle-to-trailer wiring harness or are trying to locate the cause of an electrical problem, This connector tester is great for testing left, right, tail and brake lights for proper function.

When the socket is getting proper power, the tester's LEDs will light up corresponding to each wire in the connector.

Easy Testing
Simply plug the tester inline to the tow vehicle, turn on the lights and check the easy to read LEDs. Let you know quickly if problem of lights are with vehicle harness of the trailer wiring system, and let you easily identify which light you are testing.

Compact Design
Small size with key ring is easy for storage, fits easily in glove compartment or pocket, No Batteries Required! Take this small light weight tester wherever you go and drive with confidence, test any 4-pin trailer even if you are in the middle of nowhere.

Testing Procedure:
1.Connect the 4-way flat circuit tester to the 4-way flat connectors of the tow vehicle.
2.Turn on the lights to be tested (Taillights, Right Turn Signal, Left Turn Signal, and Brake Lights).
3.Check the LED indicator lights on the circuit tester for the respective lights tured on.
4.The LED indicator light would light up respectively if both the power and ground connections are good.
5.Remove the inline circuit tester once the trailer lights are working as intended.