Why Is My Turn Signal Blinking Fast? How Do I Fix blinking

The turn signal is a crucial component of any vehicle as It communicates your intention to turn or change lanes to other drivers, keeping everyone safe. When your turn signal blinks too fast, it can be frustrating and potentially dangerous for other drivers. This blog will explore common causes and solutions about Why Is My Turn Signal Blinking Fast.

Whether you’re a seasoned mechanic or a novice driver, these tips will help you keep your vehicle’s turn signals working properly and ensure safe driving for yourself and others on the road.

How Do Turn Signals Work?

Turn signals rely on a simple circuit that includes an electrical switch, a power source, and some indicator light or signal inside lights. When the driver presses the turn signal lever, it activates this circuit by completing the connection between two wires. This sends an electrical current through a relay switch in the car’s control module, which triggers the appropriate turn signal lights.

The most common type of turn signal is known as an incandescent bulb. These bulbs have been used for decades and produce light by heating a filament inside the bulb until it glows brightly enough to be seen from the outside.

Why Is My Turn Signal Blinking Fast | Causes 

It’s essential to address the cause of the problem. Here are some reasons why your turn signal might be blinking too fast and how to fix it.

Why Is My Turn Signal Blinking Fast

Burned-Out Bulb:

Turn signals are designed to blink steadily, but when one or more bulbs burn out, the system tries to make up for the missing light by flashing faster. This important safety feature alerts drivers behind you that you’re turning or changing lanes.

To check if your turn signal bulb is burned out, turn on your hazard lights and walk around your car to see which bulbs are not lighting up. If only one side is affected, chances are it’s just one bulb that needs replacing. If both sides are flashing rapidly, then it’s likely a problem with the flasher relay.

Incorrect Bulb Type:

Different bulbs are available for turn signals, including standard incandescent bulbs and newer LED options. If you’ve installed the wrong type of bulb in your vehicle, it can lead to a fast-flashing turn signal.

This is because each bulb has a specific resistance level that affects how quickly it heats up and cools down when electricity flows through it. The turn signal may only work properly if the resistance level is correct for your vehicle’s electrical system.

Faulty Flasher Relay:

If there’s an issue with the flasher relay, it can cause your turn signals to malfunction in various ways. If the relay sticks in its closed position or doesn’t make contact properly, it can result in rapid flashing instead of a steady blinking rate. This may also occur if there’s a loose connection between the wiring and the flasher unit.

Bad Turn Signal Switch:

This can be dangerous because it can confuse other drivers on the road who may need to know which direction you intend to turn. It’s important to have your car inspected by a professional if you notice any issues with your turn signals, as they are crucial for safe driving.

Wiring Issues:

You might be experiencing a problem with your vehicle’s wiring system. This could include anything from damaged wiring connections to worn-out fuses or relays.

LED Upgrades Without Load Resistors:

LED bulbs offer advantages over traditional incandescent counterparts but can also cause issues if installed incorrectly or with the right supporting equipment.

Upgrades without load resistors can cause turn signals to flash too fast because these bulbs draw much less power than traditional bulbs. This means that the vehicle’s computer may interpret them as being burnt out or malfunctioning, causing it to hyper-flash to alert the driver that there is an issue.

Why Is My Turn Signal Blinking Fast | Solutions?

The good news is that there are several solutions to this problem, and we’re here to help you understand why your turn signal is blinking fast and how do I fix blinking.
Below, we have explained 6 solutions for fast-blinking turn signals:

Why Is My Turn Signal Blinking Fast

Replace Burned-Out Bulbs:

Fixing a fast-blinking turn signal is simple; you can do it yourself without visiting a mechanic. The first step is to locate which bulb has burned out, depending on whether the front or rear bulb is faulty.

You can begin by checking if both front or rear signals are blinking too fast and if both bulbs have a problem. Turn off your car engine to replace burnt-out bulbs and ensure all lights are switched off.

Ensure The Correct Bulb Type:

Using an incorrect bulb with a higher wattage can cause excessive heat buildup, melting, or damaging the socket and wiring harness. Using a lower-wattage bulb can result in inadequate illumination, making it difficult for other drivers to see your signal. To prevent these issues, always check your car’s owner’s manual for instructions on selecting the right replacement bulbs for your vehicle’s model.

Replace Flasher Relay:

The flasher relay is a small electronic component that controls the speed of your car’s turn signals. The turn signals blink erratically or quickly when it malfunctions or wears out. If this happens, you must replace the flasher relay immediately.

To replace the flasher relay, you’ll first need to find its position in your vehicle. It’s usually found under the dashboard or near the fuse box. Once you’ve located it, carefully remove it from its socket and replace it with a new one.

Inspect The Turn Signal Switch:

To inspect the turn signal switch, start by turning off your engine and removing the key from the ignition. Locate the turn signal lever or knob on your dashboard. Depending on your vehicle’s make and model, this may be on either side of the steering column or the center console. Once you’ve found it, give it a little jiggle to see if anything feels loose or broken inside.

Check The Wiring:

Wires can become frayed or corroded, causing poor connectivity and incorrect signals. Start by inspecting the connections between the signal bulb and its socket. Clean them thoroughly with a wire brush or sandpaper if they appear dirty or corroded. You may also need to replace any damaged wiring if you notice any cracks or breaks in the insulation. 

Install Load Resistors for LEDs:

Load resistors work by simulating an incandescent bulb’s power draw, which slows the blinking rate to a normal speed. They are small devices that plug into the wiring harness of your turn signal assembly and convert excess voltage into heat energy. Doing so takes some of the load off your LED bulbs and ensures a steady current flow through your circuit.

Is A Fast Blinker Illegal?

According to the National Highway Traffic Safety Administration (NHTSA), a fast blinker can be illegal. All vehicles must have functioning turn signals that meet federal safety standards.

These standards include requirements for the rate of blinking and the brightness of the lights. If your turn signals are flashing too quickly, it could indicate an issue with your vehicle’s electrical system or that you have installed aftermarket parts that do not meet these standards.

Why Is My Turn Signal Blinking Twice As Fast?

If you’ve noticed that your turn signal is blinking twice as fast as usual, there’s a good chance something is amiss. Various factors can cause this change in the blinking rate, but one of the most common is a change in the electrical load within the circuit.

The cause of this issue is a burnt-out bulb. When one of the bulbs in either the front or back circuit goes out, it causes the remaining bulb to blink faster than normal.

A possible reason for a turn signal blinking twice as fast could be a problem with the flasher relay. This device controls and regulates the speed at which your turn signals blink.

Why Is My Turn Signal Blinking Fast

If it becomes damaged or faulty, it can cause your signals to blink too quickly or not work. This might require replacing the entire relay unit. A corroded socket could lead to a malfunctioning turn signal system that blinks twice as fast. 

When you activate your turn signal, it creates an electrical load on the circuit, which causes it to blink if there are changes in this load. If a bulb burns out or there’s damage to the wiring, then this can cause your turn signal to start blinking faster than usual. This happens because the flasher unit (which controls the rate of flashing) responds to changes in load by increasing or decreasing its frequency.

Can A Fuse Cause A Turn Signal To Blink Fast?

Fuses are small devices that protect your car’s electrical system from overloading or short-circuiting. When a fuse blows, it stops the flow of electricity to the affected component of your turn signals.

If you notice that your turn signals are blinking faster than usual, it could indicate that one of the fuses has blown or is about to blow. This happens because when there’s a fault in the turn signal circuitry, the resistance in the system increases and draws more current than usual. This increased demand can cause the fuse to heat up and eventually blow out.

Can A Faulty Relay Cause A Fast Blinking Turn Signal?

A relay is an electrical switch that controls the current flow in a circuit. A faulty relay can also cause your turn signal to blink rapidly. If the relay fails to function correctly in your car’s turn signal system, it may send periodic signals to the bulbs, causing them to flash faster than usual. The blinking frequency doubles when one or more bulbs fail in a circuit because it reduces resistance and causes less current flow.

Why Is My Turn Signal Blinking Fast

Moisture can enter your car’s electrical system and cause corrosion on some components. A corroded relay won’t work properly and will also lead to rapid flashing of your turn signals.

Do LED Bulbs Cause a Turn Signal to Blink Fast?

LED bulbs are becoming increasingly popular in the automotive industry due to their energy efficiency and long-lasting lifespan. A common problem drivers may encounter after switching to LED turn signal bulbs is that they may start blinking quickly or rapidly. This phenomenon is known as hyper flashing, and it can be quite frustrating for drivers trying to indicate their intentions while driving properly.

The primary cause of hyper flashing in LED turn signals is related to their low power consumption. Traditional incandescent bulbs draw a higher amount of current than LEDs, which means that when an LED bulb is installed instead of an incandescent one, there isn’t enough resistance in the circuit.

This triggers the car’s flasher relay (the device responsible for regulating the blink rate) to detect a burnt-out bulb, causing it to blink rapidly as a warning sign.

Can Wiring Problems Lead to A Fast-Blinking Turn Signal?

If your turn signal blinks too fast, it could indicate a wiring problem. A faulty flasher relay or bulb typically causes a fast-blinking turn signal. It can also be due to wiring issues. If an electrical short or open circuit in the wiring connects the flasher relay to the turn signal bulbs, it can cause the current to flow faster than normal, resulting in a fast blink.

Other signs of wiring problems include intermittent flashing and dimming or complete failure of the turn signal lights. These issues should not be ignored as they can compromise your safety on the road.

How Do I Know If My Turn Signal Relay Is Bad?

  • Check for ticking sounds: When you activate your turn signals, listen for a ticking sound from under the dashboard or near the fuse box. If you don’t hear anything, it could be a sign that the relay is faulty.
  • Look for flashing lights: When you activate your turn signals, check if they’re flashing. It could be because of a bad relay if they stay on without blinking or only intermittently.
  • Test other electrical components: If other electrical components in your vehicle malfunction (such as the headlights or brake line lights), this could indicate a problem with the turn signal relay.

Can I Drive My Car With A Fast-Blinking Turn Signal?

As a driver, you must ensure your vehicle is equipped with functional turn signals. They are an integral part of communication on the road and alert other drivers about your intentions to change lanes or make turns. If you notice a fast-blinking turn signal in your car, determining whether you should continue driving or pullover is still being determined.

The fast blinking of a turn signal indicates an issue with your car’s electrical system. It could be due to several reasons, including a burnt-out bulb, corroded socket, or damaged wiring. It may seem like a minor problem, but ignoring a malfunctioning turn signal can cause traffic violations and accidents on the road.

Can I Replace A Turn Signal Bulb Myself?

Yes, you can replace a turn signal bulb yourself. The process is relatively straightforward and requires minimal tools. Locate the bulb that needs to be replaced.

Depending on your vehicle, this may require opening the hood or removing a panel from the inside of your car. Once you have located the bulb, check whether it has a power connector or two metal contacts.

If it has a power connector, unplug it and remove the bulb. If it has two metal contacts, twist the bulb counterclockwise to remove it. Insert the new bulb into the socket and twist it clockwise until it is firmly in place. Plug in any power connectors and test your turn signal to ensure it works properly before putting everything back together.

How Do I Install Load Resistors For LED Turn Signals?

Installing load resistors for LED turn signals is a relatively simple process. You will need to purchase the correct size resistor for your vehicle. You should find this information in the user manual or online. Once you have the correct resistor, you must connect it in series with the LED turn signal.

It means that one end of the resistor needs to be connected to the positive wire of the LED, and the other end of the resistor needs to be connected to the negative wire of the LED. 

Ensure all connections are secure and insulated properly before testing your new setup. Once everything is connected, you should test your turn signal lights and ensure they work correctly. If all looks good, you have successfully installed load resistors for your LED turn signals.

How Often Should I Replace My Turn Signal Bulbs?

You should replace your turn signal bulbs every 5 to 6 months because the heat generated by the bulbs can cause them to wear out over time, decreasing brightness and visibility. If you notice any flickering or dimming of the light, it’s best to replace the bulb as soon as possible.

Keeping track of when they were last changed is important to ensure you replace your turn signal bulbs on time. You can do this by noting the date in your vehicle’s maintenance log or writing it on a calendar.

Doing this will help ensure your bulbs are always up-to-date and functioning properly.  Suppose you must figure out how often to replace your turn signal bulbs. It’s best to consult an expert mechanic who can provide advice tailored specifically to your vehicle and its needs.

Ambient Lighting

Ambient lighting refers to the overall illumination in a space that creates a pleasant and inviting atmosphere. It is typically soft, diffused, and evenly distributed throughout the room.

This lighting eliminates harsh shadows and provides a comfortable brightness for various activities. Ambient lighting can be achieved through ceiling fixtures, wall sconces, or natural light sources such as windows or skylights. 

It helps create a warm and cozy ambiance in residential settings, promoting relaxation and productivity in commercial spaces. Whether for entertaining guests or working on tasks, ambient lighting is crucial in enhancing any room’s overall mood and functionality.

Ending of Why Is My Turn Signal Blinking Fast:

As discussed in the above guide about Why Is My Turn Signal Blinking Fast, we concluded that it is a relatively simple process that requires just a few basic tools and time.

By identifying the root cause of the problem, whether a burned-out bulb or a faulty relay switch, and taking the appropriate steps to address it, you can restore your turn signals to their normal function in no time.

Remember to prioritize safety when working on your vehicle, and don’t hesitate to seek professional help. With these tips, you’ll return to the road with fully functioning turn signals. So go ahead and give it a try.


What are load Resistors?

Load resistors are used to provide a load to an electrical circuit. They are typically used in power supplies, amplifiers, and other circuits where a load is needed for the circuit to function properly.

How long will it Take to fix the Problem?

The amount of time needed to fix the problem depends on several factors, such as the complexity of the issue and the resources available. If it’s a relatively simple problem, it may take only a few minutes or hours to diagnose and resolve.