One of the most common problems that arises when replacing stock filament bulbs with LED bulbs in most vehicles is hyper flashing or bulb out warnings. For safety reasons most vehicles use either of these methods to tell the driver that a bulb somewhere on the car has burned out.
How does the car know that there is a bulb out?
There is a part in the vehicle that controls when to hyper flash or show a warning. It's called a flasher unit. Each vehicle's flasher unit is designed to monitor the electrical load that it is powering. This basically means that the flasher unit knows how much current your cars factory bulbs will draw when they're in use. It monitors the vehicle's left/right circuit or monitors all 4 bulbs independently.
When one of the bulbs is burnt out, removed, or replaced with a lower wattage bulb/LED the flasher does its job and starts flashing at a faster pace on the side of the car that this has occurred.
How do you prevent the car from hyper flashing?
The solution is to either replace the flasher unit in your vehicle or add enough load back onto the system to trick the electrical system into thinking that nothing has changed. Correcting hyper flash or bulb out warnings when you upgrade is relatively easy once you understand what needs to be done.
Step 1: Find out the load value required for your vehicle
Load resistors will be required for all vehicles that do not have a replaceable flasher unit or there is no VLEDS replacement flasher. Now that we understand how the flasher unit works we can trick it. The trick is to put the original load back on the flasher unit. We have load resistors that allow us to do this. Continue reading