- switches large currents remotely from the circuit in which the current flows, allowing the use of thinner wires and switch contacts;
- has more than one control input, unlike a mechanical switch;
- performs the function of a timer, for example, sets the interval for the windshield wipers to operate.
If the electrical circuit controlled by the relay fails and the relay is probably the cause of the fault, listen to the relay while the system is on. If the relay is working properly, you should hear a click when it is turned on. If the relay is working properly, the fault lies in the components or connecting wires. If the relay does not work, it is not receiving the main power or control pulse, or the relay is faulty.
Most relays are installed in the fuse and relay box located in the engine compartment.
Some specialized relays are located separately or in separate blocks under the instrument panel and in the engine compartment.