4-Way Trailer Light Tester. Fits four-way flat trailer plugs. Test left, right, tail and brake lights for proper function.
4 WAY FLAT & 7 WAY ROUND TRAILER WIRING TESTER LIGHT BRAKE TAIL TURN SIGNAL SET
7 Way Round & 5 Way Flat Trailer Plug Tester Wiring Tester Light Brake Tail Set
2 NEW SEASENSE VEHICLE 4-WAY FLAT TRAILER LIGHTS CIRCUIT TESTERS,TROUBLE SHOOTER
4 Way Flat & 7 Blade Round Trailer Wiring Circuit Tester Brake Tail Light Plug
4 Way Flat Plugs Trailer Light Circuit Tester Test Left Right Tail Brake Lights
