Driving lights and indicators question

Discussion in 'The Projects Forum' started by Aitch42, Apr 23, 2012.

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  1. Aitch42

    Thread Starter New Member

    Apr 23, 2012
    In the UK it is now a legal requirement for new cars to have white driving lights on when the headlamps are off. I am wanting to add this feature to the kit car I finished last year and am getting confused with the electronics - I hope someone here can help.

    The problem:
    The driving lights need to be on when the engine is running - when the indicator is on the lights should dim or extinguish all together. I am looking at doing this with a single extra wire to the indicator and then put the necessary electronics on a PCB which will replace the indicator/bulb assembly. My problem is that I can't seem to find a way of dimming the white lights when the indicator is on without running wires back to the dashboard - which would be a pain.

    Is there a way of using the flasher pulse to trigger a 555 timer to dim/extinguish the white LEDs whilst the indicor is on?

    The two LED circuits are simple series LEDs with a suitable resistor - power is 12v.

    Any help would be appreciated
  2. P-MONKE


    Mar 14, 2012
    Unfortunately, automotive modification topics are against the forum rules: No more Automotive Guidelines even if your topic does seem quite benign...
  3. Wendy


    Mar 24, 2008
    Unfortunately this is true.

    The owners of All About Circuits has elected not to host discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:


    Automotive modifications of any kind are strictly forbidden. Therefore, this thread will be closed.

    Please try to understand the reasons behind this action, and feel free to browse and use the forums.

    You might find answers to your questions in one of these forums:

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