How many car drivers, in your opinion, utilize their turn signals before making a turn or changing lanes on the road - statically virtually all drivers in the world. The turn signal functions as a courtesy message to other drivers, it is required by the laws of most countries and stands as a communicant to alert other drivers of your intended direction, allowing them to analyze their next move. However when this important automobile light develops faults like unnecessary rapid flashing or clicking fast, then it’s time to have a look at what is going on. Generally, the major cause of rapid flashing turn signals is a faulty flashbulb, however, there are a million and one reasons that can cause this rapid blinking. A lot of automobile owners, including yourself, are actively searching the net for solutions. Luckily, this article will outline what causes your turn blinker flashing quickly and provide the necessary remedies to the 'why does my blinker blink fast' problem.

What Causes Turn Signal Blinking Fast

The turn signal in any vehicle operates the same way. It has a signal circuit with enough power to send the signal past the circuit fuse. The circuit fuse completes the action when you adjust the external signal arms. The supplied power is transmitted to the bulb in the direction you designate via the second load circuit. Whenever the circuit is switched on, the flashing is activated in place of a solid beam of light. As a result, the current, which is dictated by the bulbs, determines the turn signal. If either of these variables changes, your blinker's timing will alter from its initial state, causing the left blinker to blink quickly or/and the right blinker to blink slowly. The most frequent reasons for rapid flashing in turn signals are listed below.

Insufficient Voltage:

The signal is activated by voltages by pushing charged electrons through a conducting loop, enabling them to illuminate the bulb. The automobile system voltage is shared by many light systems like parking and alerting systems are all included, however, there is a possibility that the power supplied to the left or right turn detector is inadequate or sometimes excessive, causing rapid flashing. Also, voltage failure is also caused by filthy or malfunctioning combo switches as they are unable to receive and provide the necessary parts with the correct voltage amount.

Bad Bulb:

There are 4 separate blinker bulbs in an automobile; two bulbs on the opposite sides of the car at the front and rear ends. The most common cause of turn signal blinking fast is faulty or burned-out bulbs. This reason is due to the bulb's components. The bulbs are dual filamentous, hence, if one of the filaments is destroyed or the glass bulb is cracked, the bulb will fail and blink rapidly. The rapid flashing of the turn signals could potentially be caused by a faulty or corroded bulb socket that retains and provides circuit signals.

Broken Connections:

The turn signal connection consists of components joined together by wires to an electric source to Turn on the lights. Turn signal blinking quickly can also be caused by a loose connection at the bulbs or a failed turn signal switch, as well as a general ground connection failure. Corroded, damaged, burned, or scorched wires at any intersection of the automobile circuit can change the voltage supply or current obtained in any of the bulbs, altering the blinking speed of the signal.

Damaged turn Signal Relay:

The electrical mechanism that controls your car's turn signal is known as the turn signal relay. The flasher is in charge of most of everything, which is why it blinks; it comes in different shapes, forms, and sizes. Most damaged relays are caused by consistent wear and tear sure to extreme environmental conditions like water or snow. A damaged turn signal is mostly caused by a damaged signal bulb and a major damaging symptom is rapid signal flashing.

Turn Signal Fuse:

Like all light systems in an automobile, a turn signal relies on a fuse that supplies electric power to its circuit. It is usually located on the lower dash at the driver’s compartment, although newer car models are making different variants. The electricity to the hazard lights switch will be cut off or limited if a fuse is out or partially broken, resulting in fast blinking of the turn signal.

How To Fix Signal Blinking Fast

But the bulb is fine, why is the turn signal still blinking? Rhetoric by most automobile owners once their solution for how to fix turn signal blinking fast encounters a deadlock. For automobile drivers that swear the damaged bulb was the cause of their turn signal blinking fast, the aforementioned has shown damaged parts, worn-out components, and connection problems can also be major causes of turn signal blinking fast. As automobile owners, identifying the problem is a major step to proffering the needed solutions. With millions of solutions on the internet promising to resolve these issues, one can only hope they apply the right one. From the words of experienced automobile specialists and countless research that have been tested and proven to work, here are the top 5 techniques to resolve the turn signal blinking fast problem.

Check Turn Signal Operation:

Checking the operation of your car's turn signals is a must-do routine check, and it can be done in two ways: with or without equipment.

Without equipment:

Because a defective turn signal is frequently exposed by prompt flashing lights, an irregularity in each signal turn is simpler to spot. To trigger the lightning on the right turn sign, raise the blinker and move away from the vehicle to observe the front and back bulbs blinking. To determine the damaged sections, repeat the process on the left and pay attention to the blinking tempo.

With equipment:

This turn signal operation is more detailed than the former. Turn signal self-diagnosis might seem difficult as the car connections and wirings are all intertwined. However, some tips and tricks can turn signal diagnosis from a chore to a hobby. To begin properly, ensure you have a test light and a digital multimeter. The test light, popularly called test lamp or voltage tester is a simple electronic tool that helps automobile users test their car's electrical circuit, it checks for the presence or absence of electricity in a component. A digital multimeter (DMM) measures the quantities of current, resistance, and even voltage. These two electronic equipment coupled with your automobile manual will help you locate connections, access, replace, and repair electrical components in the car.

Fixing Faulty Bulbs:

Before fixing a faulty bulb, ensure you purchase the correct bulb type as many variations are being produced by automobile manufacturers. You can get this information by reading your automobile manual, searching the internet, or simply asking a friend with a similar car type or the automobile attendant in the store. Ensure you disconnect your battery’s car to prevent electrical accidents. Remove the old bulb by opening either the lid (if the faulty bulb is in front) or the trunk (if the faulty bulb is at the rear). Disconnect the wirings on the old bulb and pull out the faulty bulb by rotating counter-clockwise, before pulling the lost bulb towards your direction for easy removal. Replace the new bulb by connecting the electrical cap. Rotate the bulb in a clockwise direction until it is snug and fits perfectly, then replace all the car components. Test the new bulbs by activating the turn signal to ensure it has a steady blinking rate.

Damaged Wires:

Replacing or reconnecting damaged wires may seem too tactical for the average automobile owner as it is best left to professionals. However, very skilled automobile owners can rewire damaged connections and even replace frayed wires. The use of the automobile manual, a voltage tester, and a DMM will have the time spent in repairs. Ensure the connections are even and not mangled up with tapes, cut out burnt and frayed wires and replace them with newer ones. Solder the needed connections and ensure they are snug.

Working on the Relay:

Working on the turn signal relay is as easy as changing your tires. Start by locating the relay cluster and then locate your turn signal relay; the position of these compartments differs from car to car and requires the vehicle's manual if it proves to be difficult. Remove the old turn signal flashers and replace them with new ones. In terms of the wrong installation, don’t bother as the flashers only go in one right way. Replace or cover necessary car parts and you are good to go. The first step to correcting resistance-related issues is to understand what resistance is in an electrical circuit. Resistance resists or limits the flow of electric current around a circuit. Most automobile specialists test your car relay's resistance by setting up a DMM to the two terminals. The acceptable calculation for a functioning turn signal relay is within the range of 50 to 220 ohms and anything out of this limit is deemed dangerous. Ensure your relay circuit wiring is as short as possible as long wires increase resistance in a circuit.

Frequently Asked Questions (FAQs):

How do you test a turn signal flasher relay?

In the junction box, look for the flasher relay. Attach the clip of the voltage analyzer to earth (bare ground) using the main wire running from the turn signal relay when the car is turned on. The relay is in proper working order if the bulb turns on.
Remove the relay for better verifiability and study its control and terminals, which may be double-checked. Use the DMM and place the test wires on the terminals, it should show no continuity.

Is a fast blinker illegal?

In most of the world, fast blinking or hyper flashing is illegal and is punishable by a fine. When your blinkers turn on 105 to 120 times in one month, it is regarded to be hyper flashing and the state’s department of transport of most countries have accrued specific fines to any driver caught.
Hyper flashing is fined and illegal because it is harmful as it has an impact on other drivers and can cause accidents. It creates an extremely confusing environment for other drivers and may cause them to take unnecessary turns, diverting their attention from driving.

Where is my turn signal relay?

The turn signal relay is normally found under the dashboard of the car’s front seat or in the gas tank near the battery or around the steering wheel. However, depending on the type of vehicle, the location may vary.

What is a LED flasher relay?

The LED flasher relay is built to control the flash rate of the automobile turn signal by providing constant resistance to the supply of electricity flowing into the indicator circuit, hence causing the blinking effect. There are majorly 3 types of LED flasher relay—thermal, electronic, and electromechanical.

How much does a turn signal relay cost?

Luckily, a new turn signal relay dies not cost as much as other car components. It is neither pocket draining as it costs between $50 to $150, according to a recent survey. Although this price varies from automobile specialists to auto repair shops as it can be lower or even higher than the aforementioned range.
However, if you intend on getting your hands dirty, replacing the turn signal relay cost lesser. It is estimated you will spend around $20 to $100 for purchasing the parts alone; you can also find used parts on Amazon and eBay for $20 or less.


The relay circuit is unarguably one of the important wiring compartments. It is also one of the most common car problems automobile owners face as it is being used during driving. However, there is more to turn signals blinking fast than faulty bulbs lights as poor connection and wirings, resistance-related issues, and damaged turn signal relay play a huge role. Luckily, these issues can easily be rectified by simple repairs or replacements to get your turn signals back to normalcy.