Why is my Turn Signal Blinking Fast? And How to Fix it?

Every driver is occasionally confronted with a situation they have never dealt with before. A variety of questions emerge when this happens, and the driver tries to figure out why their car suddenly starts behaving weird.

One of the weirdest problems that frequently draws the attention of a cautious driver is when a turn signal flashes quickly on one side of their car but not the other. While this is a rather frequent situation, there is still uncertainty about the underlying origin of this problem.

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The bulb of a turn signal can flash fast for a variety of reasons, all of which could point to a variety of problems. Let’s find out what causes a fast-blinking turn signal and how to fix them if they occur in the future.

How Do Turn Signals Work?

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To get to the root of a quickly blinking turn signal problem, one must first understand the fundamentals of turn signal operation. The turn signal circuit of a car is mainly made of three parts:

1- The Signal Circuit:

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The turn signal relay receives power from the battery through a fuse. The circuit is connected only when you raise or lower the signal control arm.

2- Bulb:

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After moving the control arm, it transfers electricity through a second load circuit that includes the lights according to the direction you’ve selected. Afterward, the lamp is turned on. To generate the flashing action, the electricity is transmitted through a flasher.

3- Flasher:

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Flashers are temperature-controlled and engineered to bend at specific intervals dependent on electrical conditions. Flashers are designed with a heat-resistant ring of metal. Depending on how much current is flowing through the band, the metal will heat up and cool down ( straightening and bending to break or complete the circuit), producing a flickering effect.

Common Causes of a Fast Blinking Turn Signal

My turn signal is blinking rapidly, but all of my other lights are working. What is happening?

Check your brake, reverse, and directional (turn) lights to see whether they are all functional. Even if you can’t see the blinking lights from inside your car, the dashboard indicators can tell you if something is wrong.

Assume you notice on your dashboard that one or both of your turn signals are flashing rapidly. Surprisingly, the directional light might still be operational, indicating that they are still powered by the car’s battery.

If you discover any of the turn lights aren’t working, it might be because of a faulty bulb that has been overheated and burned out. Once you’ve removed the bulb, keep an eye out for any unusually dark colors.

If the turn signals still don’t function properly, the car’s fuses and relays may also be to blame.

The following are some of the most typical causes of your car’s turn signal blinking quickly:

A Bad Ground Connection:

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The turn signal wires are likely to become weak and rusty with time, and disconnections could occur over time. As a result, there is no capacity for a proper ground connection, which prevents the turn signal from operating.

When the ground connection fails, your vehicle’s turn signals will not work properly. A quick check on the cables will help you pinpoint the problem. You may use a test light or a multimeter to do this.

Voltage is Too Low:

Another probable explanation why your turn signal suddenly starts blinking quickly might be the inadequate electricity supply from the car’s electrical system. Such a problem suggests that your car’s connecting switch may be malfunctioning.

The Bulb is Faulty:

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Blinking turn signals can be caused by burned-out bulbs, which in turn can be caused by faulty resistance switches. As a result, the switch causes the light to alternately flash slowly and rapidly.

When two bulbs in a certain direction are in good condition, the flasher relay is conditioned to flash at the appropriate pace. However, if one of the bulbs on either the left or right side is blown, the relay begins to flash twice as quick.

If you notice that your turn signal is blinking too quickly even with a new bulb installed, then it might be because of the following:

Turn Signal Relay:

In some cases, a malfunctioning flasher relay in the vehicle might result in the turn signal blinking more rapidly. This problem is commonly caused by rusted relay pins due to water exposure.

In addition to this, flasher relays that appear insufficient might be the reason for the directional light blinking. What exactly does this mean? The original turn signal flasher relay that comes with your vehicle is designed to work with the manufacturer’s settings.

Basically, it’s a good fit for the bulb’s wattage and produces the desired blinking frequency. However, the blinking speed of the turn signal would alter if you replaced it with a different brand.

How can you know whether your car’s relay is in excellent working condition? You should hear the “clicking” sounds that they make when electricity is delivered to them.

Turn Signal Fuse:

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It’s possible that the signal fuse has blown; thus, making sure it’s in excellent shape might be helpful. If your old one has failed, you’ll need a new turn signal fuse. A wide range of alternatives is available.

The relay and the fuse may be located beneath the hood or within the car, depending on the model of your car. Please refer to your vehicle’s owner’s handbook to find the position of your car’s relay and fuse.

Various Methods for Fixing a Fast Blinking Turn Signal

Suppose you notice that the turn signal on your car or motorbike is blinking rapidly. In that case, you should take steps to correct the situation. Following the steps in the following paragraphs will walk you through the process of fixing your own turn signals.

1- Dashboard is Not Enough:

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It would assist if you first step down from your car to access the turn signal bulbs. In some cases, your dashboard may not be providing enough information. So, get out of the vehicle and examine the back and front bulbs.

You should have already turned on the turn signal from inside the car. Check whether any of the bulbs doesn’t turn on. Then, take a closer look to see if any bulb is blinking quicker than the other. If you discover all lights operating in good condition, then there is no problem here.

2- Changing Burned Bulbs:

Generally, a defective light bulb is to blame when the signal lights flash more rapidly. As a result, you should remove the bulb’s cover and examine it closely. To get to the bulb, you’ll need to lift the hood.

You may have to remove the battery, the front bumper, or even the air filter box to get to the air filter in some vehicles. If there is a black fog, the bulb is not operating correctly. Once detected that the signal bulb is burned, an appropriate replacement is needed.

3- Check the Relay:

If the bulbs appear to be in excellent shape, but your turn signals are still flashing, you should have the relay checked. In the event of a problem with the relay, you will not hear the click sound that it usually makes. In addition, a faulty relay will not supply power to the signal bulb.

It is important to remember that the left and right signal lights will stop operating if a defective relay is installed in the vehicle. Changing the relay may appear to be a difficult task to some. Because of this, you may need the help of a professional to replace the defective relay.

4- Broken Wires:

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If the light bulb and the relay are in good condition, it may be that the turn signal light is flashing too quickly because of faulty connections. So, if you notice that your turn signal is blinking too fast with a new bulb, you’ll need to do a test.

Each wire and each connection must be tested individually. You can solve the problem once you identify the faulty wire.

Is it illegal to have a fast blinking turn signal?

The question of whether or not a quick blinker is prohibited is subject to debate. The speed at which a vehicle’s turn signal can flash is set by the Department of Transportation at 120 times per minute. On the other hand, individual state legislation may set a lower maximum allowable limit.

Therefore, the legality of hyper flashing greatly depends on the speed at which it happens and the state in which one is traveling.

Hyper flashing can, at the very least, attract the attention of law enforcement. A hyper flashing turn signal may be highly annoying to other drivers because of the quick flashing light.


You and other drivers are at great risk if you don’t use your turn signal since it’s a critical component of safe driving. The signal light’s power source is the car’s battery, which is routed through a fuse. This fuse then directs the electricity to the relay’s switch side.

As a result, the signal light flashes at a typical rate. If your turn signal is flashing rapidly, what should I do? Problems like this indicate an issue that needs immediate attention.

Does your vehicle have a turn signal with a fast-blinking LED bulb? This article can help you figure out what’s going on and what you can do about it.

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10 months ago

Useless, my car isn’t mentioned and it’s a Ford Fusion 2017.