Use to test four way flat trailer plugs on towing vehicles. Test right, left, turn, and brake lights for proper function.
4 Way Trailer Light Tester Circuit Functions Brake signal Trailer Plug Tester
4 Way Trailer Light Tester Flat Plugs - Test Left, Right, Tail, and Brake Lights
Cal-Hawk 7-Way Trailer Light Tester - 6 Function LED Indicators, CZTLT7
4 WAY FLAT TRAILER WIRING TESTER LIGHT BRAKE TAIL TURN SIGNAL TROUBLE SHOOTER
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
