Expand the wires, connect the red clip to the positive electrode of the car battery, and connect the black clip to the negative pole terminal of the car battery. the "Positive Extreme" button. The LED light up.The terminal to activate the component.If the LED turns green and the beeurizer makes a sound, stop the test and check whether the component is defective, or whether the current rated value of the component is higher than the current rated value of the tester. The power circuit probe tester uses advanced high -sensitivity probes to provide you with fast and accurate testing, which can a lot of time to eliminate the car wiring circuit failure, quickly and accurately locate the fault line and its fault point.The tester also has an overload protection device. When the current exceeds 7A, the circuit breaker inside the device automatically automatically automatically automatically automatically automatically automatically reminds. The power circuit probe tester is made of insulating