Features: Automotive relay test tool. 1. By connecting to the car battery (11V-15V), the detector can accurately check the relay contact function. 2. The tester observes contact data, closing time, relay inertia in each test step, etc. 3. Test to accurately control the opening and closing of the relay. 4. If the relay is abnormal, the red LED lights up, if it is normal, the green LED lights up. 5. Fine workmanship and good performance. 6. Easy to use. 7. Convenient to carry. 8. Durable in use. Description: Material: Plastic & Metal Color: Black & Red Voltage: 12V Size: approx. 105 * 60 * 25mm 1. Connect the power cables to the car battery - black crocodile clip to negative pole, red crocodile clip to positive pole. 2. The tester turns on when the LED lights RED. 3. Check the relay before connecting it to the tester. If it is a 4-pin relay, select 4 pins on the tester. If it is a 5-pin relay, select 5 pins on the tester. 4. Connect the relay to one of the three sockets. 5. Press the TEST button. 6. The tester will check the pin configuration of the unknown relay. The tester will light the RED LED if the unknown relay is not the same as most common automotive relays or if the pin of the unknown relay is destroyed. 7. The tester will open and close the relay 10 times to test the time to the contacts' closing and opening if the relay's pin configuration is correct. The tester will light the RED LED immediately if the time is exceeded. 8. The tester will check the relay's consistency after testing the time to the contacts' closing and opening ten times. The tester will light the GREEN LED if the test passed, otherwise the RED LED will light. 9. Disconnect the power cables from the car battery and remove the relay from the tester. Note: 1. The car battery must be a 12V battery, and the battery voltage is between 11V-15V. 2. Ideal for coil resistance above 20 ohms. Package includes: 1 x Car Relay Tester