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when you flip your blinker on, a relay in the circuit is activated which turns the light on and off.

also, the front blinker and rear blinker usually alternate in turning off and on, so when the back is on, the front will be off, and reverse.. that's why when a bulb is out, the clicking sound in the vehicle goes faster than when both are in working order.

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Q: What causes brake lights to flash when left blinker is turned on?
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