A car relay is an essential component in modern vehicles, acting as an electrically operated switch that controls the flow of power to various systems such as lights, horns, and fuel pumps. When a relay fails, it can lead to malfunctioning of critical car functions, and diagnosing the issue quickly can save both time and money. One of the best ways to test a relay is by using a multimeter. This tool helps in checking whether the relay is working as expected and can identify potential faults. In this article, we will go over how to test a car relay with a multimeter step by step.
What is a Car Relay? A car relay is a small electromagnetic switch that controls high-current circuits with a low-current signal. It has several pins, typically four or five, each serving a different purpose. Two pins (usually 85 and 86) are used to energize the coil inside the relay, and the other two (30 and 87) are for the switch mechanism, which opens and closes the electrical circuit. Understanding the role of each pin is critical when testing the relay with a multimeter. Tools Required To test a car relay, you will need the following tools： A multimeter (digital or analog)
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