How To Test a Relay (and How Relays Work) - in 14 minutes

#starterrelay #voltagetest #resistancetestmultimeter #benchtest How to Test a Starter Relay (Complete Diagnostic Guide) (Voltage Test, Resistance Test, Bench Test) If your car won’t start, makes a clicking sound, or has intermittent starting problems, a faulty starter relay could be the cause. In this complete diagnostic guide, you’ll learn how to test a starter relay step by step using a multimeter so you can accurately determine whether the relay is working or needs replacement. This video explains the starter relay working principle, relay pin functions (30, 85, 86, 87), voltage testing, resistance testing, and bench testing, making it easy for beginners and DIY mechanics to diagnose starting system problems without guessing or replacing unnecessary parts. By watching this guide, you will understand how electrical power flows through a starter relay and how to safely test it using a multimeter to identify common no-crank issues. What You’ll Learn: how a starter relay works, Starter relay pin 30, 85, 86, 87 explained how to test a starter relay with a multimeter Voltage test for starter relay how to test relay coil bench test starter relay How to diagnose no-crank starter problems how to know if a starter relay is bad This guide is perfect for DIY car owners, beginner mechanics, and automotive students who want a clear and practical starter relay diagnostic process. ⏱️ Time Chapters 00:01 Intro 01:04 Relay Working Principle 02:55 Relay Pin 30, 85, 86, 87 Explained 05:28 Multimeter Testing Overview 05:38 Voltage Test 08:19 Resistance Test 10:50: Bench Test 13:29 Conclusion Frequently Asked Questions: How do I know if my starter relay is bad? You can test it using a multimeter by checking voltage at pin 30 and 86, resistance between pins 85 and 86, and continuity between pins 30 and 87 during bench testing. Can a bad starter relay cause a clicking sound? Yes, a faulty starter relay can cause clicking sounds, no-crank conditions, or intermittent starting problems. What voltage should be at starter relay pin 30? Pin 30 should always have around 12 volts from the battery. What is the normal resistance of a starter relay? Most starter relays have coil resistance between 50 and 120 ohms. Can I test a starter relay without removing it? Yes, voltage testing can be done in the fuse box, but resistance and bench testing require removing the relay. Related Videos: 4 Symptoms of a Bad Starter Relay And How to Fix It    • 4 Symptoms of a Bad Starter Relay And How ...   How to Test a Starter Motor with a Multimeter (Complete Starter test)    • How to Test a Starter Motor with a Multime...   How to Diagnose a No-Crank, No-Start Problem Step by Step    • How to Diagnose a No-Crank, No-Start Probl...   👍 Support AutoFix Problem If this video helped you learn how to test a starter relay, make sure to: ✔ Like the video ✔ Subscribe to AutoFix Problem ✔ Share with friends or mechanics who need it This video explains how to test a starter relay using a multimeter, providing clear steps for proper electrical troubleshooting. You will learn how to use a multimeter to check for ground, coil resistance, and perform a bench test, which is crucial for identifying car starting problems. Follow this guide on how to test to accurately diagnose your relay.