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EP35 flasher for LEDs not working

Discussion in '1st Gen. Tacomas (1995-2004)' started by coffeybean, Aug 1, 2020.

  1. Aug 1, 2020 at 5:42 PM
    #1
    coffeybean

    coffeybean [OP] Member

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    Based on the information found in this thread https://www.tacomaworld.com/threads...g-lights-with-switchback-leds-a-how-to.85986/ I have been trying to move to the Switchback bulbs in the front. I have been struggling to get an LED flasher that will work. I bought one from Superbright which did not work with the incandescent bulbs, then a flasher from Napa. Again nothing. I thought the flashers would work with either old style bulbs and/or LEDs. Do I need to have the LED bulbs in for the new flasher to work? These mods should not be this hard! What am I doing wrong?
     
  2. Aug 2, 2020 at 2:04 AM
    #2
    Wyoming09

    Wyoming09 Well-Known Member

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    Do you know the draw of your LED bulbs ??

    Are they bright enough for use in the USA?

    Some low output led bulbs do not draw enough for the EP-35 flasher to work.

    Then your bulbs might be installed Polarity wrong or just bad out of the box.
     
  3. Aug 2, 2020 at 6:06 AM
    #3
    RysiuM

    RysiuM Well-Known Member

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    You mentioned switchback? May be not your case but some switchback work only if the "white" connector is always hot. What it means the bulb (white and orange LEDs) is powered from "white" leads and the "orange" (blinking) lead is used only to control the functionality of switching between orange and white. In that case obviously the "orange" lead takes hardly any current (it is a signal, not power). That will never work with any flasher which requires a load in order to work.
     
    1997tacomav6 and Wyoming09 like this.
  4. Aug 2, 2020 at 8:08 AM
    #4
    coffeybean

    coffeybean [OP] Member

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    RysiuM - The blinker portion of an LED bulb worked with the factory relay. I installed one LED bulb and it hyper flashed. When I turned on the flashers all bulbs worked.

    Wyoming09 - Neither relay worked with the incandescent bulbs. There should have been plenty of current draw in this configuration.
     
  5. Aug 2, 2020 at 10:20 AM
    #5
    RysiuM

    RysiuM Well-Known Member

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    Regarding EP35 it should work with LED and incandescent bulbs http://novitatech.com/?q=aftermarket/products/electronic-flashers/ep35

    Stock flasher worked without hyperflashing with one LED (tail) and one incandescent (front). I used 5W 0.4A LED bulb. Stock flasher hyperflashed when two (front and back) LEDs were used.
     
  6. Aug 2, 2020 at 4:38 PM
    #6
    coffeybean

    coffeybean [OP] Member

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    So my question is, if the EP-35L from Napa is supposed to work with incandescent bulbs why wont it? One thought is I am installing incorrectly. Not that I am the best mechanic but I do have a few hours under a hood. Two bad units from two different sources? That seems unlikely. The vehicle? Maybe. As far as I know it is very close to stock.

    What if I modified the stock unit? What are the values needed for the resistor to have it happily operate LED bulbs?
     
  7. Aug 2, 2020 at 7:54 PM
    #7
    coffeybean

    coffeybean [OP] Member

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    Update: I pulled the interior fuse box and double checked my installation. I was installing the part correctly. I later found this thread https://www.yotatech.com/forums/f2/...de-fixing-fast-blinkers-after-led-swap-80626/ and drilled the hole to disable the bulb out circuit but I misread the docs and killed the relay. So much for my wrenching skills. Tomorrow I will get another stock relay and do the mod correctly.
     
  8. Aug 4, 2020 at 8:08 PM
    #8
    coffeybean

    coffeybean [OP] Member

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    I bought a NAPA EP35 which functionally the same as the OEM part but not the same on the inside. Out comes the dremel and I removed about 75% of the material on their version of the resistor loop. Blinkers and flasher are now at an acceptable rate. Next to pull power to the running lites on the switchbacks.

    Thanks for all the help.
     

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