2 in 1 Design: This trailer light tester combines both 4 way circuit tester and 7 way trailer light tester, allows you to test both the 4 pin and the 7 blade connectors. Easy and quick to test trailer circuits on most trucks.
4 WAY FLAT & 7 WAY ROUND TRAILER WIRING TESTER LIGHT BRAKE TAIL TURN SIGNAL SET
(2) JT&T Products 2504F 4-Way Flat Molded FM & M Trailer Connector
7 Blade 4-Way Flat Circuit Tester - Trailer Testers Electricity Black
7 Way Blade & 4 Pin Trailer Light Circuit Tester w/LED Indicators Light Tester
7 Way Blade to 4 Pin Trailer Light Circuit Tester w/LED Indicators Light Tester
