Why has my car’s turn signal never synchronized perfectly with any other car’s signal literally ever?
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Turn signals are older than modern digital systems. Your turn signal bulbs draw power, that power creates a little heat inside the flasher module. This breaks the connection. Then it cools, and it makes the connection and they light up again. Over and over. Different bulbs and other factors will cause it to flash at different rates. So the timing isn’t perfect and varies from car to car.
Like everything else, they’re digital now, and have perfect consistent timing now. It’s going to become more and more likely to see perfect sync between vehicles, given that you both started your flashers at the same time.
But also… You’d have to have the same make and model to guarantee it syncs.. because there is no standard timing! There is only a range specified by law, not exact timing. So different makes and models use different timing.
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