Auto electrical v. turn brake/run into turn signal as well.

Discussion in 'OT Driven' started by dr.zed, Dec 22, 2007.

  1. dr.zed

    dr.zed DR.ZED OT Supporter

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    I have a run and brake bulb. I also have two separate wires for a turn signal. How do I combine the brake circuit to the turn signal as well? I will probably need a DPDT relay, but I can't wrap my head around this. Help!

    [​IMG]
     
  2. P07r0457

    P07r0457 New Member

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    you could use a diode, or a relay...
     
  3. P07r0457

    P07r0457 New Member

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    assuming a relay:

    [​IMG]



    NOTE: If you have your brakes on AND your turn signal, the turn signal will be remain constant-on, and would not blink!
     
  4. dr.zed

    dr.zed DR.ZED OT Supporter

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    I was going to go that exact route you suggested, but I would want the signal to flash even though I had my brake lights on.
     
  5. P07r0457

    P07r0457 New Member

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    you could use a 1157 for the turns and use the 5W side for brakes and 21W side for turn sig.


    Otherwise, it'll take a lot more wiring, and several more relays.
     
  6. dr.zed

    dr.zed DR.ZED OT Supporter

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    I'm cool with adding a relay or two.
     
  7. P07r0457

    P07r0457 New Member

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    well you'll need a capacitor, a resistor, and an extra relay.
     
  8. dr.zed

    dr.zed DR.ZED OT Supporter

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    Hook me up with some direction?
     
  9. P07r0457

    P07r0457 New Member

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    you know if you can't design these things, I have little faith that you can properly implement it.
     
  10. P07r0457

    P07r0457 New Member

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    I did some thinking about it, and I think it can be done with a single relay... It would need to be a single-pole, dual-throw relay. Good news is that these are VERY common at auto-parts stores.

    If someone can double-check this, I think it's good.

    [​IMG]
     
  11. danonboost

    danonboost I invite you

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    Just so I understand, when you hit the brake you want the brake and turn lights to luminate; then, when the blinker is on while the brake lights are you want the turn to still blink?
     
  12. dr.zed

    dr.zed DR.ZED OT Supporter

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    Yes... The brake and turn are the same filament. When the brake is on the "brake" light will flash.
     
  13. dr.zed

    dr.zed DR.ZED OT Supporter

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    While I do appreciate your help, I am having a brain fart on this particular project.
     
  14. danonboost

    danonboost I invite you

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  15. P07r0457

    P07r0457 New Member

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    i just realize that both my and danonboost's schematics will not work.

    you need to add a capacitor and resistor to the circut so that when the turn sig comes on it trips the relay and charges the capacitor -- but when the turn sig turns off we need to keep the relay tripped long enough for the light to be off -- the resistor prevents the cap from draining too fast.
     
  16. danonboost

    danonboost I invite you

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    I used this on my bike. Works fine. I got the NC relay at Radioshack.
     
  17. High Voltage

    High Voltage Guest

    im trying to make sure i understand you completely before i give you a response. are you trying to use your brake/run lights as turn signals and eliminate your OEM turn signals?
     
  18. dr.zed

    dr.zed DR.ZED OT Supporter

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    Yes. OEM is a brake and running on one bulb (dual filament). OEM is a separate turn signal on one bulb (single filament). I want to combine the turning with the OEM running/brake.

    The only change that will happen to the OEM run/brake setup is when the turn signal is on and the brakes applied the brake filament will flash.
     
  19. danonboost

    danonboost I invite you

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    Did you try the schematic?
     

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