06 Causes of Turn Signal Blinking Fast but Bulb is Good with Solutions

Have you ever experienced the frustration of your turn signal blinking unusually fast, despite having a perfectly functioning bulb? It can be perplexing and problematic, leaving you wondering what could be causing this peculiar behavior. This blog aims to shed light on this common issue that many drivers encounter – the Turn Signal Blinking Fast but Bulb is Good.
We will explore various reasons behind this phenomenon and provide possible solutions to rectify the situation, ensuring a safer and more reliable driving experience for all. So let’s delve into the intricacies of turn signals and uncover the potential culprits behind their rapid blinking!

Turn Signal Blinking Fast but Bulb is Good-6 Causes

Causes and their solutions given below.

Turn Signal Blinking Fast but Bulb is Good

Corrosion in the Socket

The factor that can cause turn signals to blink fast is corrosion in the socket. Each turn signal light is connected to a socket; over time, these sockets may become clogged with debris or corroded. It can result in the turn signal blinking rapidly instead of its average speed. The waste or corrosion obstructs the proper flow of electricity, causing an irregular blinking pattern. 
To fix this issue, cleaning the socket and removing any debris or corrosion present is necessary.


Cleaning the bulb socket is a simple task that can easily be accomplished. To begin, locate the problematic socket that is causing the issue. Once identified, use a screwdriver to open the bulb cover and carefully remove the bulb from its socket. Take notice of any corrosion or blockages within the socket area.

Next, it is crucial to address any corrosion to restore proper functionality. Applying an anti-corrosive lubricant spray to the affected area will help alleviate this issue. The anti-corrosive properties of this lubricant will not only dissolve any existing corrosion but also protect against future build-up. By taking these steps, you can ensure that your bulb socket remains clean and maximizes its lifespan.

Cleaning a bulb socket is a straightforward process that anyone can do with minimal effort and tools.

Loose Connection

Sometimes, loose wiring can make the turn signal blink quickly.


The turn lights in a car are connected to the car’s electrical system through wire connections. Short wires connect the lights to the control panel. Problems can arise if these connections become loose or the wires get damaged. A common issue in such cases is that the turn signals start blinking rapidly. To fix this problem, this is necessary to identify and address the related wires and connections. 

Can be achieved by replacing the damaged wires or re-establishing secure connections. In many instances, the ground wire tends to be at fault for causing these issues with the turn signal blinking.

To fix the hyper-blinking turn signal, follow these steps:

  • Remove any dust or dirt accumulated on the connection plugs to ensure a proper electrical connection.
  • Tighten the wire connections to eliminate any loose connections causing the issue.
  • Ensure the wires fit perfectly into their sockets to provide a secure and stable connection.

Once these steps have been completed, check if the turn signal has stopped hyper-blinking before covering the ground. Rest assured; this problem can be fixed easily by following these simple instructions.

Burnt out Fuse

A common issue with turn signals is a burnt-out fuse. It can occur due to various electrical problems, such as voltage fluctuations or other issues. When a fuse burns out or melts, it affects the functioning of the turn signals and causes them to blink rapidly. It can be frustrating for drivers as it reduces the visibility of their intentions and poses a safety risk on the road. 


If the fuse appears intact, the issue may lie with the turn light relay. Locate the relay switch for the turn lights and test it using a multimeter. If the reading shows no continuity, the relay must be replaced. However, if both the fuse and relay are functioning correctly, there might be a problem with the wiring or bulbs of the turn lights. In this case, it is recommended to consult a professional mechanic for further inspection and repair.

Faulty Switch

This switch plays a crucial role in activating the turn signals and indicating the intended direction of the vehicle. If this switch becomes faulty or starts malfunctioning, it can lead to hyper-flashing of the turn signals. Hyper-flashing refers to a speedy blinking rate of the turn signals, which can be highly distracting for other drivers on the road. 


To replace your car’s turning light switch at home, you can easily do it yourself with a screwdriver. Start by pulling the steering wheel up and removing all the screws that enclose it. Then, separate the cover below the steering wheel to gain access. Inside, you will notice two more screws holding the steering wheel lever. Carefully remove these screws and detach the switch from its position.

Faulty Electrical Control

The faulty electrical control refers to an internal system responsible for regulating the blinking system in a car. This crucial control mechanism (Power Outlet) ensures that the turn signals operate smoothly and at a consistent pace. When this system malfunctions or experiences any disorder, it can lead to a rapid blinking of the turn signals.


We know every car has a battery that supplies electrical power. A car battery usually provides 12 to 14 volts. If the voltage drops below 14 or rises above 14, the car’s control system will face many problems. When the voltage is very low, the bulbs blink faster. It isn’t a significant issue because the control system automatically detects this and adjusts accordingly. If the voltage consistently remains high or low, it can cause more severe problems.

When the voltage drops too low, it can affect various car control system components. For example, it may cause difficulties in starting the engine as there won’t be enough power to ignite fuel in the cylinders. 

In extreme cases, it can lead to frequent stalling or even complete engine failure. Other electrical systems, such as power windows and radio, may also not function properly due to insufficient power supply.

Issues with the Relay

A cause of a hyper-blinking turn signal is a faulty flasher relay. Over time, these relays can wear out due to continuous use or electrical issues. A worn-out relay may cause the electrical flow to become disrupted, resulting in faster blink rates than usual. 

A damaged or corroded wire connection to the relay can also lead to exaggerated blinking speeds.


If you are on a tight budget, you can opt for a cheaper relay option, but remember that it may only last for a short time or provide optimal performance. It is essential to ensure the new relay is compatible with your car’s make and model to avoid further issues. Test the blinking light once the relay is replaced to see if the problem has been resolved. 

If the light continues to blink or if you experience any other electrical issues, it may be necessary to consult a professional mechanic for further diagnosis and repair.

In Closing

As discussed in the above blog about Turn Signal Blinking Fast but Bulb is Good, a fast blinking turn signal can indicate a faulty flasher relay or a problem with the wiring. If you have confirmed that the bulb is in good condition, it is more likely that the culprit lies elsewhere. It is recommended to check the flasher relay and replace it if necessary. Inspecting the wiring for any loose connections or damages can help resolve the issue.
Remember, proper functioning turn signals are crucial for road safety, so it is essential promptly address any issues that arise. Don’t ignore a fast blinking turn signal—take action and ensure your vehicle’s movements are working correctly to keep yourself and others safe on the road.


What role does the combination switch play in this problem?

The combination switch, responsible for activating turn signals and other functions, might malfunction if your blinkers are blinking rapidly despite a good bulb.

Could an issue with the wiring harness contribute to fast blinking?

Yes, problems with the wiring harness, such as frayed wires or shorts, can interfere with the proper functioning of your turn signals and cause them to blink too quickly.

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