Automotive Circuit Tester - What it does: Identify and troubleshoot poor ground connections, verify continuity, and test voltage polarity quickly and accurately. - Safe diagnostics: Short circuit protection; supports 6-24 V DC testing; avoids risks from AC voltage. - Accurate and convenient: Tests electrical systems with precision; 16 ft (about 5 m) test lead extends reach to engine bay, underdash, and trailer wiring. - Easy to use: Connect to the vehicle battery, power on, and instantly check positive and negative currents. - Practical applications: - Diagnose grounding issues on cars, trucks, and motorcycles; verify battery and starter circuit grounds. - Troubleshoot trailer and accessory wiring for proper continuity and polarity. - Install or verify lights, radios, sensors, or other electronics with correct polarity and solid ground.