What Makes Turn Signals Work? (Inside a Thermal Flasher Relay) • Cars Simplified

Thermal flashers are an early method of making turn signal lights turn on and off. Inside the flasher relay is a bimetallic component with a strip element that heats up, expands just enough to push on the metal it's attached to, connects the circuit, and allows electricity to pass more freely another way while the strip cools down. When it cools down enough, it snaps back into its original position, starting the process over again.

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