Users can quickly and efficiently test electrical signals by themselves;Plugs into six-way trailer connector found on back of all trucks;Corresponding App will show you if any signals are malfunctioning;Tests brake lights, running lights, reverse lights, turn signals, and even electric trailer brakes;Helps to quickly diagnose and fix the exact malfunction for safe driving

• STEELMAN PRO 78922 Bluetooth Trailer Tester

STEELMAN PRO 78922 Bluetooth Trailer TesterSTEELMAN PRO