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the bulbs are the resistance in the circuit- lower the resistance and more amps flow which will heat up the flasher faster. flashers work like a type 1 circuit breaker. current flows through a bimetallic arm, heating it up until the arm bends and opens a set of contacts. when the current stops, the arm cools down, the contacts close and current flows again.
the ford uses an additional controller in series with multiple turn signal lamps. this transistorized module causes the three rear turn signal lamps on either side to flash in sequence from the center of the car outward.
the clear tails use bulbs that have low resistance or some have led's. lower the resistance and the flasher heats up faster.
there are also flashers that have two contact points and won't speed up when a bulb goes out. don't remember who uses them.
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