Why Does Brake Light Fuse Keep Blowing

Why Does Brake Light Fuse Keep Blowing, <h1>Why Does Brake Light Fuse Keep Blowing</h1> <p>Brake lights play a crucial role in ensuring, blog, why-does-brake-light-fuse-keep-blowing, KampionLite

Why Does Brake Light Fuse Keep Blowing

Brake lights play a crucial role in ensuring road safety by signaling your intentions to other drivers. If your brake light fuse keeps blowing, it can be a frustrating and potentially dangerous issue. Understanding the possible reasons behind this problem can help you diagnose and fix it effectively. In this article, we will explore some of the common causes for a blowing brake light fuse.

1. Short Circuit

A short circuit occurs when a wire or electrical component comes into contact with a grounded surface, causing a surge of electricity that exceeds the fuse’s capacity. This excessive flow of electricity can cause the fuse to blow. When it comes to brake lights, a short circuit can occur due to various reasons, including:

  • Exposed or damaged wiring
  • Faulty brake light switch
  • Incorrectly installed light bulbs
  • Water damage

To identify and fix a short circuit, you need to inspect the wiring and components related to your brake lights. Look for any exposed or damaged wires that may be in direct contact with metal surfaces. Additionally, check the brake light switch for any faults or loose connections. Replace any faulty components and ensure proper insulation of the wiring.

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2. Overloading

Overloading refers to a situation where the electrical system draws more current than the circuit can handle, causing the fuse to blow. This can happen if you have added additional electrical accessories or modifications to your vehicle, such as LED brake lights or aftermarket stereo systems. These additions may require more power than the original wiring and fuse can handle.

If you have recently made any modifications to your vehicle’s electrical system, consider checking if they are causing an overload. Disconnect any accessories or modifications and see if the fuse stops blowing. If it does, you may need to install a higher-capacity fuse or upgrade your electrical system to handle the additional load.

3. Chafed or Pinched Wires

Chafed or pinched wires are another common cause of a blowing brake light fuse. Over time, the wires in your vehicle’s electrical system can become worn out, exposing the conductive material inside. Additionally, wires can get pinched between moving components or body panels, causing damage and potential short circuits.

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To check for chafed or pinched wires, visually inspect the wiring leading to your brake lights. Look for any signs of wear and tear, such as exposed wires or areas where the insulation is damaged. If you find any damaged wires, use electrical tape or heat shrink tubing to repair them. Ensure that the wires are properly secured and protected from further damage.

4. Incorrect Bulb Installation

Installing incorrect or incompatible bulbs can also lead to a blowing brake light fuse. Different vehicles require specific types of bulbs with designated wattages, voltage ratings, and base types. Using bulbs that do not meet these specifications can cause an overload or short circuit in the circuit, resulting in a blown fuse.

If you recently replaced your brake light bulbs and noticed that the fuse started blowing afterward, consider checking if the bulbs are the correct type. Refer to your vehicle’s manual or consult with a professional to ensure you are using the right bulbs. Replace any incorrect bulbs with the appropriate ones and see if the fuse continues to blow.

5. Water Damage

Water can wreak havoc on your vehicle’s electrical system, leading to a blowing brake light fuse. Moisture can corrode connectors, cause wire insulation to deteriorate, and result in short circuits. Water damage can happen due to leaking seals, cracks in housing, or improper installation.

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To prevent water damage, inspect the seals and housings of your brake light assemblies. Look for any signs of cracks, gaps, or deteriorated seals. Replace any damaged components and ensure proper sealing to keep water out. Additionally, check the wiring for any signs of corrosion or water intrusion. Clean and repair any affected areas and protect them from future moisture exposure.


A blowing brake light fuse can be a frustrating and inconvenient issue to deal with. By understanding the common causes behind this problem, such as short circuits, overloading, chafed or pinched wires, incorrect bulb installation, and water damage, you can effectively diagnose and fix the issue. Remember to inspect the wiring, components, and bulbs related to your brake lights for any faults, and make necessary repairs or replacements. Prioritizing road safety by ensuring your brake lights are functioning properly is crucial for your safety and the safety of others on the road.



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