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Everyone is correct. Most auto manufacturers use this old (but well
tested) method of telling the drivers there is a bulb out. The
flasher, that's really what it's called, is replaceable like a
relay. When voltage is passed through it and out to the bulbs, the
plate or strip inside it heats and causes the regular breaking of
the circuit as bc said...but, it's actually the LOWER resistance in
the circuit, because of an absent bulb,
which causes more current to pass, faster heating of the strip and
the quicker flash rate. Hope this helps!
Matt Coia
Undergraduate Assistant, Physics Education
Buffalo State College
oh...and ASE Certified in Automotive Electronics :)