Oyviny 7 Way Blade & 4 Pin Trailer Light Circuit Tester with LED Indicators 6 Function Light Tester for RV Truck Trailer Socket Tester, 7 Pin to 4 Pin Trailer Adapter

4 Way Flat and 7 Way Blade Trailer Light Tester Part of towing responsibly is 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 taillights, brake controller output , back up or reverse circuit center pole, right turn/brake, left turn/brake and 12-volt power. When the socket is getting proper power, the tester's various LEDs will light up corresponding to each wire in the connector. Light Functions: LT – Left Turn /Brake TM – Taillights RT – Right Turn/Brake 12V – Auxiliary(12V+) BK – Electric Brakes BU – Back up Package Included: 1x 4 pin flat and 7 way blade trailer tester