Fast Blinking Turn Signal: What Could Be the Cause?

QuestionsCategory: Ask An ExpertFast Blinking Turn Signal: What Could Be the Cause?
Logan Moore asked 4 months ago
I own a 2013 Mustang GT, equipped with LED lights (except for HID headlights) and sequential turn signals at the rear. Recently, I've encountered a peculiar issue where the turn signal indicator inside the dashboard blinks rapidly when signaling right, yet all lights, including the turn signals, are functioning correctly. Interestingly, this rapid blinking happens a few times a week and reverts to normal after some minutes. This problem has persisted for a few months now. I'm seeking advice on what could be causing this and how to fix it.
1 Answers
Zack Norman Staff answered 4 months ago
Hi there, Logan! Your issue with the fast blinking turn signal in your 2013 Mustang GT, despite all lights working, can be quite perplexing - car electrics and electronics are always a chore! Here are a few potential causes and solutions, from what I can make of your descriptions and explainers:
  1. LED Specific Issues: Since your Mustang uses LED bulbs, the rapid blinking could be due to the lower power draw of LEDs compared to traditional bulbs. This can sometimes trick the vehicle's electrical system into thinking a bulb is out. Installing a resistor or getting an ECU update might resolve this.
  2. Check the Third Brake Light: Sometimes, issues in other lighting systems, like the third brake light, can affect the turn signals. Ensure this light is also functioning correctly.
  3. Bulb Health: Even though LEDs last longer, they can still fail or flicker, especially due to vibrations. Consider swapping bulbs from one side to the other to identify if a specific bulb is the issue.
  4. Flasher Relay: The problem might lie in the flasher relay or module controlling the blink rate. Replacing or upgrading it to one compatible with LEDs could be a solution.
  5. Electrical Connections: Check for loose or corroded connections in the turn signal circuit. Sometimes cleaning the connections can fix such issues.
  6. Smart Junction Box: For some Mustang models, issues with the smart junction box have been reported. It might need cleaning or, in rare cases, replacement.
Given the intermittent nature of the problem, diagnosing it might take some trial and error. Start with the simplest checks like bulb health and connections, and work your way up to more complex solutions like the smart junction box or an ECU update. Best of luck with your repairs, and do let me know if there's any other way I can help! Zack - Motor Verso Mechanics Team