Features 1. The automotive relay battery tester is a fast on-off test relay that can indicate the overall health status and function of the most common automotive relays. 2. The tester will check whether the relay contacts are working properly by connecting the car battery (11V-15V) to the relay coil. 3. The tester will observe the pin configuration, the time for contact closure and opening, and the consistency of the relay during each test. If all tests pass during the test, the tester will light up the green LED, otherwise it will light up the red LED. Explain 1. Connect the power cord to the car battery - connect the black alligator clip to the negative pole and the red alligator clip to the positive pole. 2. When the LED lights up red, the tester is powered on. 3. Check the relay before inserting the tester. If it is a 4-pin relay, please select "4-pin" on the tester. If it is a 5-pin relay, please select "5-pin" on the tester. 4. Insert the relay into one of the three sockets. 5. Press the "TEST" button. 6. The tester will check the pin configuration of unknown relays. If the unknown relay is different from most common automotive relays or if the pin of the unknown relay are damaged, the tester will light up the red LED. 7. If the pin configuration of the relay is correct, the tester will open and close the relay 10 times to test the time for the contacts to close and open. If the time expires, the tester will immediately light up the red LED. 8. After testing the contact closure and opening time of the relay for 10 times, the tester will check the consistency of the relay. If the test passes, the tester will light up the green LED, otherwise it will light up the red LED. 9. Disconnect the power cord of the car battery and remove the relay from the tester. Be careful: 1. The car battery must be a 12V battery with a voltage between 11V-15V. 2. Suitable for coil resistors above 20 ohms. Specification Material: ABS Color: Black & Red Size: 14.7 x 18.5 x 1 cm Weight: 154 g Package Include: 1x Car Relay Tester