Switchbacks | Ford Escort Owners Association (FEOA)

Switchbacks

Discussion in 'Electrical' started by novanutcase, Mar 23, 2019.

  1. novanutcase

    novanutcase FEOA Member

    Messages:
    2,321
    Likes Received:
    536
    Trophy Points:
    263
    I bought some swithchback LED lights for the front turn signals along with a loom wired with 6 ohm voltage drops. The amber leds turn on when I hit the turn signal but the white running leds do not light up.

    Any suggestions or troubleshooting?

    John
  2. denisond3

    denisond3 Moderator Staff Member

    Messages:
    9,875
    Likes Received:
    2,658
    Trophy Points:
    563
    Location:
    south TX or northern VA
    No verified suggestions. I found that leds take about 2.5 to 3.5 volts across the leads before they light, and the voltage is slightly different for different colors and different makers. So I would check what the voltage was right at the led, if possible.
  3. novanutcase

    novanutcase FEOA Member

    Messages:
    2,321
    Likes Received:
    536
    Trophy Points:
    263
    From the research I've done it seems that switchbacks work by switching the polarity of the wiring. I have Amber/White switchbacks meaning running lights on will be white and when I turn on the turn signal it should switch from between white and amber until I turn off the turn switch and should return back to just running light white.

    This diagram is what I'm basing my assumptions:

    [​IMG]

    Here's a link to the troubleshooting page I got the above image from. Lots of good info on switchback operation.

    http://www.autolumination.com/switchback_wiring.html

    I'm not sure how the Escort handles power supply to the turn signal. It would seem that they do it the conventional way by running a higher power relay for the turn signal switching and constant power for the running lights. Any suggestions as to how I can make this work with the Escort wiring? I'm thinking to get them to work I'm going to have to wire up some sort of relay system that switches polarity from the OEM bulb holder to get the white running lights to work. Any suggestions?

    John
  4. marclar

    marclar Moderator Staff Member

    Messages:
    8,731
    Likes Received:
    443
    Trophy Points:
    383
    Location:
    seabeck WA
    switch back works by reversing the power +/-. the vehicle is not wired in this way. there is +12 for running lights, and +12 for turn indicators, ground. you would need a controller box to make that work.
    zzyzzx likes this.
  5. novanutcase

    novanutcase FEOA Member

    Messages:
    2,321
    Likes Received:
    536
    Trophy Points:
    263
    How could I modify the factory wiring to switch the polarity to make them work? Relay?

    John
  6. zzyzzx

    zzyzzx FEOA Member

    Messages:
    14,622
    Likes Received:
    1,065
    Trophy Points:
    463
    Location:
    Baltimore, MD USA
    Yes, a relay would do this, but you would still need something to control the relay.
  7. novanutcase

    novanutcase FEOA Member

    Messages:
    2,321
    Likes Received:
    536
    Trophy Points:
    263
    How about a relay that switches polarity?

    In one mode it turns on the turn signal normally and in the other mode, triggered by either the running or headlights it goes into switching polarity?

    The way it is now with or without lights on it will flash normally. That works for daytime driving. I need to polarity switch once the running/headlights get turned on.

    John
  8. zzyzzx

    zzyzzx FEOA Member

    Messages:
    14,622
    Likes Received:
    1,065
    Trophy Points:
    463
    Location:
    Baltimore, MD USA
    A 12V DPDT relay can easily be wired switch polarity when activated. You would need to set power to the coil part when the headlights are on then.
    denisond3 likes this.
  9. marclar

    marclar Moderator Staff Member

    Messages:
    8,731
    Likes Received:
    443
    Trophy Points:
    383
    Location:
    seabeck WA
    i think you would need 2, 5 pin relays.
  10. zzyzzx

    zzyzzx FEOA Member

    Messages:
    14,622
    Likes Received:
    1,065
    Trophy Points:
    463
    Location:
    Baltimore, MD USA
    A single DPDT relay should work. The output to the lights would be the center of the relay outputs.
  11. novanutcase

    novanutcase FEOA Member

    Messages:
    2,321
    Likes Received:
    536
    Trophy Points:
    263
    One for each light or will one control both?

    John
  12. denisond3

    denisond3 Moderator Staff Member

    Messages:
    9,875
    Likes Received:
    2,658
    Trophy Points:
    563
    Location:
    south TX or northern VA
    I think you need one DPDT relay for each side of the car; so on a left turn the left signal can be switched by the relay, while the right side would remain unswitched. viceversa on a right turn.
    zzyzzx likes this.
  13. zzyzzx

    zzyzzx FEOA Member

    Messages:
    14,622
    Likes Received:
    1,065
    Trophy Points:
    463
    Location:
    Baltimore, MD USA
    One for each side.
  14. novanutcase

    novanutcase FEOA Member

    Messages:
    2,321
    Likes Received:
    536
    Trophy Points:
    263
    Thanks! I think I'm going to do all this on the ohm drop loom so I'm not cutting into the stock loom.

    John
  15. marclar

    marclar Moderator Staff Member

    Messages:
    8,731
    Likes Received:
    443
    Trophy Points:
    383
    Location:
    seabeck WA
    your probly right. im doing heads on a 3.5 kia right now. cant spare any extra brain.
  16. novanutcase

    novanutcase FEOA Member

    Messages:
    2,321
    Likes Received:
    536
    Trophy Points:
    263
    12 VDC 10 amp DPDT 135Ω Coil relay switch.

    [​IMG]

    LED Amp drop loom

    [​IMG]

    Will the DPDT relay in the picture work for what I want to do? Can anyone tell me where I need to cut into the loom and what tabs do I solder them to on the relay?

    John
    Last edited: Jul 14, 2019
  17. novanutcase

    novanutcase FEOA Member

    Messages:
    2,321
    Likes Received:
    536
    Trophy Points:
    263
    Anyone? Bueller?

    John
  18. zzyzzx

    zzyzzx FEOA Member

    Messages:
    14,622
    Likes Received:
    1,065
    Trophy Points:
    463
    Location:
    Baltimore, MD USA
    The stuff starting at 3:51 is what I was trying to explain:
  19. novanutcase

    novanutcase FEOA Member

    Messages:
    2,321
    Likes Received:
    536
    Trophy Points:
    263
    So having watched the part you posted I understand better how the relay works but I need to know what pin does what to be able to connect them properly. The video uses a 6 pin DPDT relay while mine is an 8 pin.

    John
  20. zzyzzx

    zzyzzx FEOA Member

    Messages:
    14,622
    Likes Received:
    1,065
    Trophy Points:
    463
    Location:
    Baltimore, MD USA
    I would need the info on your relay.
    Having said that, use the contact portion like shown in the video and use the coil part to switch the switch.

Share This Page