This is slightly different to what I'd expect when a bulb has blown as the indicator only sporadically stops illuminating bulbs and ticks really fast. This is different from when a bulb is completely blown and constantly ticks really fast and all bulbs except the blown one still illuminate briefly. This issue only appears on the right indicator, the left one is fine.

As far as written text can describe, it would go tick-tock, tick-tock, tick, tick, tick, tick-tock...

A video may explain much better; https://i.sstatic.net/Jyykf.jpg

Due to the inconsistent nature, I've only been able to observe it whilst in the car. From the reflection off another car in front of me, the front bulb definitely did not illuminate during the high-frequency ticking.

How do I diagnose what is causing this? I'd assume it is bulb and/or fuse related?

If the car make/model makes a difference, it is a 2004 Holden Astra.

2 Answers 2


If the bulbs are are working, replace the unit. Last Time I did it the flasher unit was so cheap that I do not remember the price.

  • It ended up just needing a new indicator relay (which I assume is the flasher unit you were talking about)!
    – James
    Commented Dec 13, 2021 at 23:43

This sounds very much like a loose intermittant connection.

You will need to check all the connections for that indicator from the switch onwards.

  • 1
    It could also be a damaged but not fully broken filament in the bulb, which also would be considered a loose intermittent connection.
    – Jupiter
    Commented Oct 15, 2021 at 9:54

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