Why does my turn signal blink faster when one of them goes out?
October 19, 2006 6:30 PM Subscribe
Why do my turn signals blink faster if one of them goes out?
posted by spiderskull to Science & Nature (14 answers total)
This my guess is that it's because the blinking is done by a contracting and expanding bimetal contact point that makes and breaks contact periodically as it cools down and warms up, respectively (which could also be making the ticking sound). When one of the lights goes out, it's drawing half as much current, so somehow that is changing the rate at which the bimetal strip conducts heat.
That, or assuming the lights are in parallel, the resistance changes, which then changes the circuit as a whole -- maybe if there's something like a 555 timer controlling the frequency, and the resistor ratio changes it causes the frequency to double.
Can someone please verify this for me? Gruesome details would be awesome.