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If a turn signal bulb burns out why does it flash faster?

Updated: 8/17/2019
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14y ago

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Technically if the bulb burns out it doesn't flash at all. The indicator in the car usually does, though, and that's probably what you're asking about. In many cars, the flashing is controlled by a "flasher" unit, which is essentially a small relay. The delay on the flasher depends on the current draw by the bulb. If the bulb burns out, there is no current draw, and the flasher oscillates faster.

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14y ago
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Q: If a turn signal bulb burns out why does it flash faster?
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