Want To Know How To Fix Turn Signals Blinking Fast?

Do you know the turn signals are one of the essential systems that ensure your safety on the road?

Turn signals specify the direction through flashing front and rear headlights. But one day, these turn signals suddenly blink faster than usual, and you do not know what to do? Do not worry; this is not a big deal.

You can fix this problem yourself without bringing it to the repair shop. In fact, turn signals are one of the simplest components to troubleshoot.

Read our instruction below, and you will know how to fix turn signals blinking fast.

Reasons for the Turn Signal’s Blinking Fast

Before jumping to the solution, let’s find out what makes your turn signal blink rapidly.

Dead bulb

There is no doubt that a defective bulb is the most common cause. When any of the turn light bulbs stop working, the flashers start to blink rapidly.

This usually occurs when the bulbs are damaged or broken. The amount of drained current changes, and as a result, the relay flashes with abnormal speed.

Open Circuit Or Short In The Wiring

Another reason is an open circuit on one of the light bulbs, which stops the power from reaching one of the light bulbs.

The problem can also come from a skinned wire. The current flowing from the circuit to the vehicle body, or a short to ground, will be created.

Faulty flasher relay

Clearly, a defective flasher relay or rusted relay pins can cause this issue. But you should know that this does not usually happen, for example, when water reaches the fuse box and brings corrosion or rush to the fuses and relays pins.

How To Solve The Turn Signals’ Fast Blinking Issue

Step 1. Check all the turn signals

Ensure that all the turn signals are working by using the multi-function switch to turn on them on the side they are blinking fast.

If they are still working, you can skip step 2 and 3.

Step 2. Check the defective light bulb

Your problem usually lies there. You need to take out the light bulbs to examine whether the wire inside is damaged. If you see a black fog on the bulb, it is not usable anymore.

If you are not clear about how to remove your light bulbs, check the manufacturer’s manual for instructions.

In some cases, finding these bulbs is very simple because you have enough space to take it out. Meanwhile, on some cars, you need to remove the battery or air filter box first. That is why you should look at the manual.

If the problem lies in the turn signal light bulb, replace the broken bulb, and test the new one again. If there is still speedy blinking, go to step 3.

Step 3. Check the power and ground

The next thing to examine is whether good power and ground come to the bulb socket or not. If not, the light cannot light up and can make fast blinking.

You need to unplug the turn signal connector and test the power and ground by using a multimeter or a test light. If there is no problem with the power and ground, the light bulb socket can be defective. Replace it, and you have done. If not, continue with step 4.

Step 4. Check the turn signal relay

The control side of the relay that stops working cannot make the relay click anymore. Thus, the light bulbs will not have enough power to work.

A defective relay can make all the left or all the right signals stop functioning together. If only one of the left or right signal works, jump to step 6.

But when all of the turn signals on one side do not function, you need to take the relay out to check the continuity of its control side. If it is okay, then check the switch side of the relay next.

A bad reading on this continuity test means that you need to replace the relay.

Step 5. Replace the relay

Actually, replacing the turn signal relay is one of the easiest fixings to do. Plus, it is not expensive, so you can replace your old turn signal flasher relay with a new one. There is no need to worry about installing it inaccurately – it only goes in one way.

If you have replaced the turn signal relay and checked that all the light bulbs are in good condition, but the problems have not been fixed, you need to go with serious electrical troubleshooting. The wire can be damaged somewhere so that the power cannot reach its destination.

We know this will be a hard job. Following a loose wire or a ground that is not grounding can cause you neck pain. But we have to do it.

Step 6. Check the connections

There are many possible causes of the open circuit condition. Mice or squirrels may chew the electric wires, or rust may break the wires.

You need to track down the wire and test it at each connector until you find the one without power. The problem can lie between the first bad connector and the last good one. The burnt or broken wire may be in contact with a hot part inside the engine bay or rubbed against something else.


So you have already known how to fix the turn signals blinking fast.

We hope you will not deal with any trouble during your ride. In case everything goes wrong and you do not know what to do next, contact the professionals for more help!

Thank you for reading.

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