Causes, Solutions, and Costs of a Turn Signal Blinking Fast

If your turn signal is blinking faster than usual, it’s a sign of an electrical issue that could lead to serious safety problems. In this article, we’ll explore the causes of a fast-blinking turn signal, how to fix it, and the estimated cost of repairs.

Understanding the Turn Signal Working Principle

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Before we dive into the causes of a fast-blinking turn signal, let’s first understand how the turn signal works. The turn signal is a system that alerts other drivers of your intention to turn or change lanes. It works by sending an electrical current from the flasher to the bulbs, which powers the turn signal lights. When you activate the turn signal, a thermal-style flasher generates sound and a flashing signal.

Possible Causes of a Fast-Blinking Turn Signal

Several factors could cause a fast-blinking turn signal, including:

  • Failing bulb: A failing bulb can alter the resistance of the circuits, causing different currents to flow through the blinkers. This results in a faster blinking rate.
  • Damaged connections: Corroded, worn, or loose connections could also alter the resistance of the current flowing through the system, causing the turn signal to blink faster.
  • Poor bulb quality: Installing the wrong type of bulb could also alter the resistance of the circuit, triggering hyper-flashing.
  • Weak voltage: Less voltage going into the system could cause the turn signal to blink faster. This is often caused by a drained or faulty battery.
  • Defective flasher relay: A defective flasher relay could cause the turning signal to blink fast. It is responsible for controlling the flashing of the turn signal. When the turning signal is activated, the flasher relay sends an electrical signal to the bulb, causing it to blink. A defective relay won’t provide a sufficient electrical signal.
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How to Fix a Fast-Blinking Turn Signal

To fix a fast-blinking turn signal, you’ll first need to diagnose the problem to determine the cause. You can physically inspect factors like the turn indicator light bulb, battery, and wiring connections. Once you’ve identified the cause, here are some possible fixes:

  • Change the light bulb: If one of the signal direction bulbs is dim or blown out, you’ll need to replace it.
  • Fix or replace the wiring connection: Check the wiring connection for the turn signal and replace any disconnected, corroded, or exposed wires.
  • Test and replace the vehicle battery: If your vehicle’s electrical components are failing, and you have a problem starting the car, you may have a battery problem. Test the battery using a multimeter to see if it needs to be charged or replaced.
  • Clean turn signal components: Clean related components of the turn signal, like the combination switch, connection, and more. This will allow for better flow of electric current through the system.

How Much Does it Cost to Fix a Fast-Blinking Turn Signal?

The cost of fixing a fast-blinking turn signal ranges from $50 to $200, excluding labor. The cost depends on the cause of the problem. For instance, an indicator light would cost between $25 and $50, while hiring a professional to replace it could cost an extra $100.


In conclusion, having a fast-blinking turn signal is not normal and is a sign of an electrical issue that could lead to serious safety problems. The problem is often caused by a failing bulb, damaged connections, poor bulb quality, weak voltage, or a defective flasher relay. The fix could be a simple DIY project or a premium repair, depending on the cause of the problem.

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