Why YSK: Your signals alert other drivers as to what you’re doing; a signal bulb costs a few bucks and is usually a quick and easy repair to do yourself (consult YouTube); and any place that regulates motor vehicles probably requires you to have working turn signals. So knowing when and how to replace a burned out signal bulb can save you an interaction with law enforcement.
Adding: You can diagnose which bulb is out by turning on your hazard lights and checking all four corners of your car. It’ll be the one not flashing.
This is also probably a good time to check your brake lights. Put something heavy on the pedal or have a friend hold it down and check that all three brake lights illuminate. Replacing a burned out brake light is also usually pretty cheap, quick, and easy.
This 'hyperflash’ing will also happen if you have replaced an incandescent bulb with an LED bulb due to the different power requirements.
LEDs draw so much less power that they don’t draw enough current through the flasher relay. The relay will then think that the bulb is burned out.
To fix hyperflash due to having installed LED bulbs you can wire a resistor inline or replace the flasher unit with a unit designed for LED bulbs.
Yeah. And that’s why fitting arbitrary bulbs in your car isn’t allowed in some countries. You have to use something that is certified for use in your specific car. It’s the same thing with the normal headlights. You’ll annoy and blind oncoming traffic if you manage to get the wrong bulbs in. At least in some cases.
Yes, there is mandatory inspection every 2 years here. Your car will absolutely fail if you use some uncertified shit.
Blinkers will flash fast with trailer hooked up too if there is a light duty flasher.