Sequential flasher

  
When the turn signal switch SI is closed, lamp #1 will be activated and capacitor Cl will charge to the triggered voltage of Ql. As soon as the anode voltage on Ql exceeds its gate voltage by 0 V, Ql will switch into the low resistance mode, thereby triggering SCR1 to activate lamp #2 and the second timing circuit. After Q2 switches into the low resistance state, SCR2 will be triggered to activate lamp #3
Sequential flasher - schematic

When the thermal flasher interrupts the current to all three lamps, SCR1 and SCR2 are commutated and the circuit is ready for another cycle.




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