Upgrading old bulbs is tempting, but improper LED installs can cause hyper-flashing and legal issues—unless done right.
Yes, you can replace traditional turn signal bulbs with LEDs, but the upgrade often requires adding load resistors or an LED-compatible flasher relay to avoid hyper-flashing or malfunction.
Learn what’s needed to properly convert your turn signals to LED.
Understanding Turn Signal LED Conversion
Converting your turn signals to LEDs can enhance visibility, reduce power consumption, and last longer than incandescent bulbs. However, making the switch isn’t as simple as swapping bulbs. LED turn signals operate at lower resistance, which can confuse your vehicle’s electrical system and cause hyper-flashing—rapid blinking that mimics a bulb outage.
What Causes Hyper-Flashing?
Hyper-flashing occurs when the vehicle detects a drop in resistance, interpreting it as a burned-out bulb. Most car flasher relays are designed for incandescent bulbs, which draw higher current. When an LED is installed without adjusting the system, the rapid blinking can occur on one or both sides, depending on your car’s circuitry.
How to Fix Hyper-Flashing
To eliminate hyper-flashing, you can use one of two methods:
- Load Resistors
These simulate the electrical load of incandescent bulbs and “trick” the flasher relay into normal operation. You’ll need to wire them in parallel with each LED turn signal. - LED-Compatible Flasher Relays
These are designed to handle lower current loads. Replacing the original flasher unit with an LED-friendly version is a cleaner solution if your car allows it.
Step-by-Step LED Conversion Process
- Check Bulb Type and Compatibility
Identify the correct bulb size and socket type for your turn signals. Verify LED replacements match wattage and voltage specs. - Install the LED Bulbs
Simply remove the old incandescent bulbs and plug in the LEDs. - Add Load Resistors (if needed)
Mount the resistor on a metal surface away from plastic—resistors get hot. Connect one end to the turn signal wire and the other to ground. - Test Flashing Pattern
Activate your turn signals and hazard lights. If flashing is normal, the install is successful. - Replace Flasher Relay (optional)
If you prefer not to use resistors, swap the flasher relay with an LED-compatible version if your vehicle supports it.
Are LED Turn Signals Worth It?
Yes, when done correctly. LED turn signals offer:
- Longer lifespan
- Lower power consumption
- Brighter, quicker illumination
These features can improve safety, especially in poor visibility conditions.
Summary:
Converting to LED turn signals is possible and beneficial, but must be done right to avoid flashing issues.
