First, clip the tester’s alligator clip to the car battery: The black clip on the negative pole, and the red clip on the positive pole.
1.When the red LED light is on, it means the tester can start the test. Check the relay before testing. Select the appropriate socket according to the pins, insert the relay into sockets, press the "Test" button, and the tester will automatically detect the pin position of the unknown relay.
2.When the relay is not a general-purpose relay on the market or the relay is damaged, it will turn on the red LED.
3.When the pin setting is correct, the tester will open and close 10 times to detect the release time of the action. When the detection time is too long, the tester will light up the red LED light.
Settable to 4 and 5 pin relay - tests the 3 most popular automotive relays
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