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Headlight Flasher
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Schematic design and wiring diagram of Headlight Flasher
Part List :
Capacitors	Resistors
C1          =    10 μF / 25V Electrolytic Transistors Q1       = BC337 or other type of NPN transistor	R1    =   200K Ω Linear potentiometer R2    =   100K Ω ¼W R3    =      1K Ω ¼W  Others RLY  = 12V Relay SPST or SPDT
Notes
It will allow your car headlights to flash on and off at the same time or it will cause them to flash alternately. The circuit is based on the 555 timer. The time is adjusted by R1. To hook up the circuit to your car you must locate the positive wire from the fuse box to the headlights. Cut the wire and insert the relay contact and bypass switch. The bypass switch will allow you to bypass the relay contact for normal headlight operation. In the alternateing headlight configuration you must cut the positive wire to each headlight and wire in the relay contact.

Source : Electronics Lab