DaierTek Universal Car Relay Tester Battery Checker Electronic Test With 12V LED Indicator For Analyzer Diagnostic Tool Features: Automotive relays test tool. 1.Through the continuous automobile battery (11V-15V) to the relay coil, the detector can properly check the relay contact function. 2. The tester observes contact data, closure time, relay inertia at each test stage, etc. 3. Test to properly control the opening and closing of the relay. 4. If the relay is abnormal the red LED will light, it;s normal the green LED will light. 5. Fine workmanship and good performance. 6. Easy to operate. 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 leads to the car battery --black alligator clip to negative terminal, red alligator clip to positive terminal. 2. Tester is powered up when the LED illuminates in RED. 3.Check the relay before plugging into the tester. If it;s a 4 pin relay,select4 pin on the tester.If it;s a 5 pin relay, select5 pinon the tester. 4. Plug in the relay into one of the three receptacles. 5. Pre the TEST button. 6.Tester will check the pin configuration of the unknown relay. Tester will light the RED LED if the unkonwn relay is not the same to the most of common automotive relaysor the pin of the unknown relay is destroyed. 7.Tester will open and close the relay 10 times for testing the time to contact closure and opening if the pin configuration of the relay is right. Tester will light the RED LED immediately if the time is overtime. 8.Tester will check the consistency of the relay after testing the time to contacts closure and opening ten times. Tester will light the GREEN LED if the test paed, if not light the RED LED. 9. Disconnect power leads from the car battery and remove relay from the tester. Attention: 1. The car battery must be 12V battery, and the voltage of the battery is among 11V-15V. 2. Ideal for coil resistance above 20 ohms. Package Included: 1 x Car Relay Tester