Turn Signal Blinking Fast With New Bulb [Hyper Flashing]

While the blinkers or the turn signals are meant to flash, but sometimes they may go crazy fast and deviate from the whole purpose of signaling. Most of the time a fast blinking turn signal or blinker indicates a bulb is out, but it can be very confusing if you just have changed the bulb. Turn signal blinking fast with new bulb or hyper flashing basically indicates a decrease in the resistance value of the whole indicator system. So you need to dig into the whole electrical system for it. 

In this article, we will discuss the common causes and solutions for the hyper flashing problem of the car indicator system. So let us dive into it.

Why Is My Turn Signal Blinking Fast With New Bulb? 

Turn signals run on electrical power in order to make turn signals by flashing light bulbs. When the turn signal lever is activated, a circuit allows power to flow to the front and rear turn signal lights on the selected side. There are some common issues with it and they are as follows-

1. Turn Signal Or Blinker Bulb Is Out

Although you might have just replaced the bulb, there could be another blown bulb in the system. Most of the time a fast blinking indicates a bulb is out. Each turn signal has a flashing unit. It briefly pauses the circuit which produces the blinking action. Turn signals operate at a specific resistance, a failed bulb resistance changes the pace by flashing and clicking faster.

If the turn signal flashes but the bulbs are in good shape, this may indicate that the flasher relay has failed or it’s not getting enough voltage, or there’s a problem with the ground connection.

Solution For Blown Blinker Bulb

Find the blown bulb in the system and have it replaced or you can replace it yourself too. Make sure that you use the bulb as specified in the owner’s manual. A bulb with wrong resistance will still cause you problems and the issue will not be solved. It is a good practice to use a contact cleaner, to remove any rust on contacts, before installing the new bulb.

2. A Blown Turn Signal Relay

Relays or commonly called flashers can go bad with time due to water damage, other environmental stresses, or damages caused by heat. These components are based on a three-pin flasher relay that works on principles of electromechanics to appropriately power turn and hazard signals. Typically, a switch is engaged, which energizes the electromagnet in the relay.

This electromagnet closes contacts that power the flasher and lighting circuit. Typically, a bad circuit will cause the timing of the relay to go bad.

How To Deal With A Bad Turn Signal Relay?

One of the easiest repairs ever is to change the relay. Find the relay cluster and the turn signal relay in your car. Next, replace the old signal flasher relay with the new one, and the very next minute, your car is back to normal blinking. Just make sure that you are using the same relay as required by the system.

3. Use Of LED Bulbs

The LED lighting draws much less power, the reason why it lasts way longer than standard incandescent lighting that comes stock with most vehicles. The reduced power draw of LEDs has advantages too. But, the replacement of turn signal bulbs with LEDs will cause what is called hyper flashing. Hyper flashing is turn signals blinking faster than your stock bulbs did.

As the new LED bulbs draw such little power, your turn signal relay sees the bulbs as being out.

How To Properly Use LED Bulbs?

You can use an LED flasher module, that is specifically designed for LED bulbs. This is the easiest way to fix hyper flashing. These modules are priced fairly and are usually simple to install. There is a load resistor kit too. Unlike plug-and-play LED flasher modules, load resistor kits require some wiring to install.

4. Bad Electric Grounds

Turn signal blinking fast with new bulb can due to some completely different reason too. Sometimes it is not the bulb but a bad ground connection. If the combination switches are bad or rusty, this clearly indicates that the ground connections are in bad shape. Another reason behind fast flashing turn signals is that the ground wire is not installed tight enough or has rust build-up, preventing it to operate normally.

Ways To Deal With Bad Grounds

Having knowledge about the locations will be a huge help. They generally are thick cables going from the minus battery clamp on one side and to the car body on the other. For cleaning, you’ll need some contact spray to remove the extra rust. After a thorough cleaning, tight the ground contacts according to the specs.

5. Faulty Car BCM

The body control unit in your car is the same as the engine control module. It controls and connects the numerous non-engine-related systems in your car. These include the lighting, windows, central locking, and HVAC. It can be difficult to diagnose a failing body control unit, especially if the symptoms are intermittent and varied. Check to see if there are any errors logged in the body control module memory.

Options To Reapair BCM

Most of the time, a damaged BCM can’t be repaired. Water, vibration, heat, and age can cause a module to fail. Depending on the placement of the unit in your vehicle, it can be difficult to avoid. If the problem is simply broken solder joints, then they can be repaired, otherwise, you have to get them replaced

How Much Will It Cost To Fix Hyper Flashing Turn Signals?

The good news is that the cost of fixing the turn signal blinking fast with new bulb is not that much and you can get the whole issue fixed for as low as 10$. But if the BCM is bad, then you have to shed up to 500%. Checking the electrical system is also cheap with some 50-100% range.


The turn signal blinking fast with new bulb can be a very confusing situation but it is some of the easiest fixes in the car. Our guide has simplified the process for you. If you still have any questions then comment down below. 


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