![]() ![]() The magnet then closes a second, independent electrical circuit, allowing high amperage to flow through it directly to a component. Instead, a switch activated by a driver or machine operator simply sends a low-amperage current through a relay, which activates the electromagnet inside it. That can burn its contact points over time. They help extend the life of switches by making it unnecessary to route the high amperage flow of electricity needed by a system directly through a switch. Relays have an internal electromagnet that opens and closes a circuit to stop and start the flow of electricity. Here’s how to go about it.įirst, though, it’s important to know how relays work. But determining whether or not a relay is defective requires a little basic investigation. ![]() So if a component isn’t working because electricity isn’t getting to it, there is a possibility the relay may be faulty. Many electrical components in a vehicle or machine are controlled by a relay. ![]()
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