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Turn Signal Blinking Fast

A turn signal that suddenly blinks much faster than normal almost always means a bulb on that side has failed, at the front, rear or in the mirror or wing repeater.

Normal risk

Fix it soon. Other drivers may not see your signal, and it is often an inspection item.

Short answer · Why is my indicator blinking fast?

The flasher circuit detects the current drawn by the bulbs. When one bulb fails, the current drops and the system blinks faster to warn you. Check all the indicator bulbs on the side that blinks fast. Aftermarket LED bulbs can cause the same effect because they draw less current.

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Safe checks you can do

  1. Walk around the carWith the indicator on, check front, rear and side repeaters.
  2. Replace the failed bulbUse the correct type.
  3. Check LED replacementsThey may need a load resistor or a compatible type.

Questions that narrow it down

  1. Is it one side only?A bulb on that side has failed.
  2. Were LED bulbs fitted?They can cause fast flashing.
  3. Are both sides fast?Check the flasher unit or settings.

Possible causes

Listed without ranking. Use the questions above to see which ones fit your car.

  1. Failed indicator bulbMost common cause.
  2. Corroded bulb holderPoor contact.
  3. Aftermarket LED bulbsLower current draw.
  4. Damaged wiringOpen circuit.

Questions about Turn Signal Blinking Fast

Is it a fuse?

Rarely; a fuse usually stops the indicators completely.

Can a mirror repeater cause it?

Yes, the side repeater counts as part of the circuit.