Turn signals and hazard flashers are a crucial part of vehicle operation safety. Hazard lights and turn signals typically use the same bulbs and the same flasher to simplify the amount of parts on your vehicle. Your flasher controls the “blink” on both systems. It contains coils inside which opens and closes the electrical circuit to create a flashing rather the the bulbs having a constant glow. They are simple mechanical units that are usually easy to access and replace.

Part 1 of 1: Replacing a turn signal or hazard flasher

Materials Needed

  • Replacement signal flasher

  • Replacement hazard Flasher

  • Note: Some cars use one for both and some cars use separate units.

Step 1: Locate the turn signal flasher. Look to your user’s manual for information on the flasher’s location. Most manufacturers will place the flasher inside the cab of the vehicle under the dashboard. This allows us to hear the switch making connections as well (ever forget your blinker was on?).

Depending on the make of the vehicle, the flasher may be located under the hood in the main fuse box instead.

Step 2: Remove the old flasher. Once you have located the flasher, you will need to get a good grip on it. Its prongs will pull straight out.

  • Note This is the point you will want to compare your replacement flasher with your old flasher. Check for the proper number of prongs, same arrangement of prongs, and for same electrical ratings.

Step 3: Install the new flasher. Simply push the new flasher into place where you removed the old flasher. It should push in free and clear. If you have to force it in, something is wrong.

Step 4: Test the hazards and blinkers. With the vehicle in park, turn your key to accessory and test the turn signals. If they work and blink correctly, test the hazards.

Hazards and turn signals are part of the “nonverbal” communication tools critical for driver safety. Without properly functioning hazards and turn signals, not only is your vehicle not legally allowed to be on the road, but you are a great hazard to other drivers. Replacing the flasher unit can be done in a reasonable amount of time. Flashers are relatively inexpensive and easy to obtain. For help fixing issues such as these, contact a certified technicia, such as one from YourMechanic, to replace your turn signal or hazard lights for you.

This article originally appeared on YourMechanic.com as How to Replace a Turn Signal / Hazard Flasher and was authored by Jessica Howe.


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