20 Jul Fixing Hyper-Flash on LED indicator bulbs
Why do I get hyper-flash when after installing LED indicator bulbs?
Hyper-flash or rapid flash is one of the most common issues when you change out your stock bulbs for LED indicator bulbs.
To understand what LED hyper-flash is we need to understand the differences between 12v bulbs and LED blubs.
A 12v bulb typically consists of a glass enclosure containing a tungsten filament. An electric current passes through the tungsten filamentcausing a resistance, this resistance heats the tungsten filament to a very high temperature which produces light. When a bulb blows you get a drop in resistance and then you get the rapid clicking in the relay.
A LED bulb draws considerably less power than a typical 12v Bulb and thus the resistance is considerably less which in turn causes the relay to hyper-flash even though the LED bulb is not blown but flashing at a very rapid rate.
So now we understand hyper-flash and how the phenomenon arises we can now go about solving the issue.
There are a number of ways to solve hyper-flash which we will run you through in the next few paragraphs. It is up to you to choose which option is the best fix for you can your car/bike etc or ask an auto electrician.
Install load resistors.
We install the load resistors with block terminals (which are attached to the resistor) between the positive (+) red wire and negative (-) black wire causing a load on the circuit. When we put the load on the circuit we have no drop in resistance and no hyper-flash.
We can also install PnP(Plug and Play) load resistors which are a lot easier to install but a bit more expensive.
Install an Led Relay
Most vehicles have a flasher relay installed which regulates the speed that the indicators flash at. However, flasher relays are designed for incandescent bulbs that draw a lot more power than an LED bulb. You can install an LED relay, which is PnP(Plug and Play) and designed to work with LED bulbs.
Changing out the flasher relay will solve the hyper-flash issue.
On newer vehicles if you do not have a relay installed than the ECU regulates the speed of the indicator flash. The ECU will also give you an error message on your dashboard. Some vehicles give you the ability to change the current or remove the error message. You may have to install 3rd party software however our advice would be to contact an auto electrician as the ECU can be very sensitive.