There are a few steps you must take before you may get in the car and turn on the motor. One of the most important—and frequently disregarded—parts of any car ignition system is the ignition relay. A small electrical component called the ignition relay is situated in a large current motor’s starting circuit. A high-current circuit’s current is controlled by the relay, which is merely a remote-control switch. The car’s ignition relay closes the much more potent starting circuit with a modest amount of ignition switch electricity.

In numerous automotive applications, the ignition relay and the starter solenoid team up to power the starter mechanism. In some situations, an ignition switch can directly control a starter solenoid circuit. Since these are often little cars, the starter motor doesn’t need a lot of electricity to operate. Well in this article we’ll be discussing the necessary things to know about ignition relays.

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So, let’s begin!


What is an ignition relay?

The ignition relay is essentially a piece of electrical equipment that switches power to your car’s fuel system and ignition system. As soon as you turn the key in the ignition of your car, the ignition relay is put into action.

The ignition relay then turns on the power and permits it to reach the systems that must be powered on in order for your vehicle to operate. As a result, the battery sends energy to the ignition coil, which in turn sends energy to the spark plugs in your car to start the engine.

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Where is the Ignition Relay Located?

Depending on the car’s design and manufacturer, the precise location of the ignition relay may vary from one vehicle to the next. The fuse box under the hood is frequently where you’ll find the ignition relay. It can also be found within the car, in a fuse box under the dashboard.

You can use the repair handbook that the manufacturer of your car gave you to locate the ignition relay quickly and identify it correctly. Along with many other relays mounted on it, it will be found in the relay panel.

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What are the Symptoms of a Bad/failing Ignition Relay?

Below are the symptoms of a failing ignition relay;

Car Ignition problem

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Engine Stalls

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Dead Battery after night

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Fluctuating Ignition power

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Bad electronic smell

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How do you test an ignition relay?

Below are the materials and tools needed for a successful test;

Below are the steps involved in testing an ignition relay;

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What are the functions of an ignition relay?

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How much is an ignition relay Replacement Cost?

Depending on the car’s model and labor expenses, replacing an ignition relay typically costs between $15 and $100. Costs for labor and ignition relays range from $10 to $50.

Depending on whether you want to purchase an OEM or aftermarket ignition relay, you might anticipate paying less than $10 for the relay itself.

The replacement of the ignition relay is frequently also fairly simple. If you prefer a mechanic to handle it instead, you may anticipate paying between $15 and $100 for the replacement.

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Ignition relay FAQs

What causes a relay to fail?

Springs gradually lose their resilience. Poor contact alignment and open coils can also cause relays to malfunction. The key element influencing relay reliability is choosing the right relay type for a particular application. When incorporating them into circuits, numerous subpar design techniques are employed.

Can a bad relay drain your battery?

The ignition relay is essentially a switch for the power to the ignition system’s electrical components. Its responsibility is to ensure that electricity is transferred from the battery to the various devices that require it. Your battery will be depleted and the ignition will be challenging to start due to a bad relay.

What is the function of a relay in a car?

What functions does a relay serve in a car? Relays are widely used in circuits to reduce the amount of electricity flowing through the primary control switch. To turn on and off a much better potential relay, use a sensor, timer, or switch with a very low amperage.

How many relays are in a car?

Up to twenty automotive relays can be found in a standard car, and they can be found all over the place.

How do you reset a relay switch?

Use a push button as a start and a relay contact (or an aux relay) as a hold-in across the start button to make things simple. At that point, your float switch is a series stop switch. Naturally, the latter would need to be shut down during regular business hours.

What happens if the ignition relay fails?

The fuel pump and ignition system will lose power if the relay malfunctions, which will cause no power and, consequently, no start. The accessories and maybe the engine can be turned on by turning the key.

How long do ignition relays last?

every time the car is started, the ignition relay is activated. The ignition relay is made to survive as long as the car, much like the other relays on it.

What is the purpose of a fuse in the ignition system?

Fuses serve as safety valve that limits the amount of electricity that can pass through wiring and other electrical circuit components. Short circuits or overcurrent occurrences can result in overloads. If the fuse’s current rating is exceeded, the metallic “element” of the fuse overheats, melts and opens the circuit.

That’s all for this article where we discussed the answers to the following questions related to ignition relay;

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