AERMOTOR Automotive Circuit Relay Tester Repair Tool 1. Can quickly detect whether your relay is normal, easy to use, suitable for automotive relays on the market, support 12V and 24V relay testing 2. Most car lights, wipers, starters, air conditioners, electric seats, electric doors and windows, anti-lock brakes and audio use relays. Automotive relays are subject to vibration, high temperature, low temperature, humidity, etc., which will reduce their lifespan. However, once a relay fails, it will immediately cause system components to be paralyzed, and even cause the entire aircraft to be unusable. Therefore, it is very important to regularly check the relays in the car 3. Through the continuous car battery to the relay coil, the detector can normally check the contact function of the relay 4. The tester observes the contact data, closing time, relay inertia, etc. at each test stage 5. Easy to operate, easy to carry, and durable Operation instructions: 1. When testing, clamp the red clip to the positive pole of the battery and the black clip to the negative pole of the battery 2. When testing a 12V relay, it needs to be connected to a 12V battery 3. After connecting to the power supply, the device lights up red and the relay can be inserted 4. To test the 4-pin relay, turn the switch to 4PIN, and to test the 5-pin relay, turn the switch to 5PIN 5. After connecting the relay and adjusting the pin position switch, you can press the button 6. If the pin position is incorrect or the relay is damaged during the test, the red LED light will be on 7. When the pin position is set correctly, the tester will light up the green LED light and flash 10 times to indicate that the relay is normal