What Does A Relay Do In A Car

An electro magnet also called a coil is used to pull a set of contacts or pins together.

A thin wire runs from the control switch on the steering column or dashboard while a second thin wire goes to an earthing point. This is how relays work. An electrical relay is a switch that is under the control of another circuit. A second thick cable goes from the relay to the component.

Why not just use an ordinary on off switch you ask. A relay is an electro mechanical switch. A relay is an electromechanical device that can be used to make or break an electrical connection. Instead it activates a relay which passes the signal on so that the car can start.

This condition delivers the the physical closing and opening of contacts. A classic example is the system used to start a car when someone turns an ignition key the ignition does not interact directly with the car battery. A spring holds the armature in position and when the relay is de energised an air gap in the magnetic circuit is created. They use a small electric current to trigger a much bigger one.

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Use a circuit tester to check whether current is reaching the. You can read our earlier post on how relays work for a more detail description of how relays operate. In an automotive relay with two contacts this would mean that one contact is opened while the other is closed. The fuel pump relay is the electronic component found on all vehicles with an internal combustion engine.

If one of your accessories doesn t come on and you suspect the relay is bad you. A relay is an electromagnetic switch operated by a relatively small electric current that can turn on or off a much larger electric current. Whenever you operate a switch to an accessory in your car that carries a lot of current such as the lights wipers or horn you run a small amount of current through a relay which in turn closes contacts to operate the accessory. The blower motor relay is the electrical switch that is used to supply the power for the vehicle s blower motor.

Automotive relays of all shapes and sizes can be found in just about every car truck and even boats. It consists of a flexible moving mechanical part which can be controlled electronically through an electromagnet basically a relay is just like a mechanical switch but you can control it with an electronic signal instead of manually turning it on or off. The blower motor is the component responsible for pushing air through the vents of. Relays in general are used to enable a low amperage circuit to switch on or off a higher amperage circuit like turning on your headlights.

Whenever the ignition is turned on the fuel pump relay will supply or pass on a consistent voltage to the fuel pump.