How to Fix BMW Tail Light Connector Issues: A Comprehensive Guide

September 02, 2023
How to Fix BMW Tail Light Connector Issues: A Comprehensive Guide
Published on  Updated on  
How to Fix BMW Tail Light Connector Issues: A Comprehensive Guide


BMW cars are known for their performance, luxury, and reliability. However, like any other vehicle, they are not immune to issues. One such problem that has been discussed extensively in forums like Bimmerpost is the issue of a melted tail light connector. This problem seems to be particularly prevalent in the 2012-2015 BMW 3-Series and 4-Series models. In this blog post, we'll delve into the issue, its causes, and how to fix it yourself.

Melted Connector

The Problem: Melted Tail Light Connector

Many BMW owners have reported that their left brake light went out unexpectedly. Upon further inspection, they found that the light connector had melted along with the bulb socket. This issue is not just a simple bulb replacement but involves the connector itself, which can be a bit more complicated to fix.

Burnt Bulb

Causes of the Issue

  • Faulty Bulb: One of the causes could be a faulty bulb. Some users have reported finding a black mark near the base of the bulb.
  • Inadequate Wiring: The wiring or the connector might be inadequately sized to handle the current, leading to overheating and melting.
  • Corrosion: Over time, the ground wire may corrode, causing poor conductivity and leading to overheating.

DIY Solutions

Finding the Right Parts

Before you start, you'll need to find the right parts. You can either go to a local dealer or find the parts online. Some users have reported that their local dealers had the parts in stock, which suggests that this is a common issue.


Steps to Fix the BMW Tail Light Connector

  1. Inspect the Connector: Open the tail light assembly and inspect the connector and the bulb socket.
  2. Remove the Damaged Parts: Carefully remove the melted connector and bulb socket.
  3. Install New Parts: Install the new connector and bulb socket.
  4. Test: Before putting everything back together, test to make sure the light is working.

Alternative Repair Method

Some users have suggested a more durable fix involving soldering a bit of speaker cable to the metal inside the housing to create a thicker ground, which is less likely to fail.


While the BMW Tail Light Connector issue can be a bit daunting, it's something that you can fix yourself with a bit of time and the right parts. Always remember to exercise caution when working with electrical components and consider seeking professional help if you're not comfortable doing it yourself.

Further Reading

For more detailed discussions and solutions, you can visit forums like Bimmerpost where many users have shared their experiences and solutions.

Remember, regular maintenance and timely repairs are key to enjoying your BMW for years to come.

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