The importance of relay testerMost car lights, wipers, starters, air conditioners, electric seats, electric doors and windows, anti-lock brakes, and audio all use relays. Automotive relays suffer from vibration, high temperature, low temperature, humidity, etc., which will reduce their life. But once the relay fails, it will immediately cause the paralysis of the system components, and even cause the entire vehicle to be unusable. Therefore, it is very important to regularly check the relays inside the car. Tester will check for proper functioning of the relay contacts by connecting the car battery (11V--15V) to the relay coil.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.DescriptionMaterial: Plastic & Metal Color: Black & Red Voltage: 12V Size: approx. 110 * 60 * 28mm product name:automotive relay tester 1 x 12V Relay TesterFive High Advantages1.Safety and environmental protection 2.Good durability 3.Cost-effective 4.Strong temperature resistance 5.Lightweight and generousNote:Car battery must be 12V battery, the voltage must be between 11-15V. The coil resistance is preferably at least 20 ohms. Please allow 0-1 cm errors due to manual measurement.How to use the tool?The Steps are as Follows 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,select 4 pin on the tester.If it s a 5 pin relay, select 5 pin on the tester. 4. Plug in the relay into one of the three receptacles. 5. Press 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 contacts 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 passed, if not light the RED LED. 9. Disconnect power leads from the car battery and remove relay from the tester. It can quickly detect whether the relay is normal or not. When using a simple test, it needs to be connected to the car s 11V-15V battery. The tester will automatically detect the pin position, the release time of the action and the consistency of the relay in each test stage. If the tester lights up in green, it means the relay is normal, and lights in red means its not normal.Insulation material, fine workmanshipSeamless docking, more solid. More robust and durable, long service lifeClampInsulation material to ensure safety, good occlusion, more accurate test resultsLong cable1 meter extension cord is more convenient to useInterfaceSeamless butt joint, stronger and longer service life, strong and durable4 PIN/5PIN4PIN/5PIN switch, TEST is the first buttonInsulation material, fine workmanshipSeamless docking, more solid. More robust and durable, long service lifeQ&AQ1: Can it detect relays for 24V trucks battery? A1: It cant. It only support 12v car. Q2: How do I know if my relay is good? A2: The green light on the display relay is OK. Red light on means the relay is abnormal. Q3: Product not working? A3: First confirm whether the positive and negative clips are placed correctly. Second, is the detection light on? Has the correct pin been selected according to the requirements?Package List:1* 12v relay tester 1* English user manual 1* Tool bag(selection)