DUOYI DY18 Car Circuit Tester is a comprehensive 6V–24V DC automotive circuit tester designed to speed up electrical diagnostics. Unlike a basic test light, it allows you to actively power components and perform advanced continuity tests without needing additional jumper wires. Key Features & Capabilities Active Power Injection: By rocking the power switch forward or backward, you can conduct a positive or negative battery current directly to the probe tip to activate components like fans, fuel pumps, or window motors. Instant Continuity Testing: Use the probe tip along with the auxiliary ground lead to test switches, relays, diodes, and fuses for continuity. Short Circuit Tracking: Helps you follow and locate short circuits without wasting fuses. If the internal circuit breaker trips, you’ve found the overloaded or shorted branch. Polarity Identification: Quickly identifies if a circuit is positive or negative. The LED indicator typically turns Red for positive ( ) and Green for negative (-). Safety Protection: Features an internal overload protection (8A breaker). If the current exceeds 8A, the unit automatically disconnects to protect the tool and the vehicle’s electronics. Feature Details Operating Voltage 6V – 24V DC Cable Length Approximately 4 meters (13 feet) Overload Protection 8A (Automatic cut-off) Indicators Bi-color LED (Red/Green) and Audio Buzzer Dimensions 220mm x 20mm How to Use for Common Tasks Polarity Test: Connect the clips to the battery. Touch the probe to a wire; Red LED = Positive, Green LED = Negative. Component Activation: To power a motor or light, touch the probe to the positive terminal and rock the power switch forward ( ). Continuity: Use the auxiliary ground lead in tandem with the probe tip. If the LED lights up Green, the circuit is continuous. Caution: Do not use this tool on 110/220V household AC currents or on sensitive electronic control units (ECUs) that operate on very low voltage, as the direct battery current may damage them. Package List Circuit tester User manual (in English)
