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LED lights problem

Discussion in 'Off Topic Hot Rods & Customs' started by mixerman, Aug 2, 2025 at 2:52 PM.

  1. mixerman
    Joined: Jun 23, 2021
    Posts: 181

    mixerman
    Member

    I install a complete electrical system in my 33.
    1) Fuse panel with complete wiring
    2) LED rear tail /stop lights w/3rd brake light
    3) LED front blinkers run / turn signal
    4) LED flashers - e-flasher and turn signal flasher
    The lights on the rear work perfect with LED flasher
    The front LED blinkers work also with light switch off except, when I pull the light switch to the first position for park/running lights, the dash blinker indicater lights come on and when I activate either blinker the blinker works but the indicator light just dims and never goes completely off.

    So I bought some incandescent blinker assenblies and hook them up and everything works perfect. I just figure what could be going on with the led blinker assemblies.

    The only other think I haven't done is install LED load diode on each light, I'd do that if I was for sure it would fix my plrblem.

    Thanks in advance
     
    Last edited: Aug 2, 2025 at 4:02 PM
    Doublepumper likes this.
  2. 19Eddy30
    Joined: Mar 27, 2011
    Posts: 3,391

    19Eddy30
    Member
    from VA

    These two pic might help you out ,working & to Study ..

    I have use this wiring a few time's
    With ""all Leds "", & 3 wire / terminal
    Led flasher , 3rd terminal is a ground
    On flasher.

    2 plug Flasher
    If just Led's ""On Rear "" then wire as
    Pic shows, Condensed bulbs on front
    & Led rear , wire as pic shows

    Bottom pic is Gm switch
    With Running just "On " in Running light
    Position pre 69

    IMG_3727.png IMG_3726.png
     
  3. Doublepumper
    Joined: Jun 26, 2016
    Posts: 1,734

    Doublepumper
    Member
    from WA-OR, USA

    I had to add resistors, even with the electronic (LED) flasher unit. The rear LED lights would work fine, but once the fronts were installed, the flasher wouldn't work with all four. I installed a different electronic flasher and had the same issue, so added the resistors and lights have worked fine since.
    Don't know if that's your problem, but thought I'd share my LED light story. Good luck!
     
  4. BJR
    Joined: Mar 11, 2005
    Posts: 11,040

    BJR
    Member

    Where did you get the resistors and what value are they?
     
    Doublepumper likes this.
  5. mixerman
    Joined: Jun 23, 2021
    Posts: 181

    mixerman
    Member

    Did you add the resistors just to the front only or rears also?
     
    Doublepumper likes this.
  6. d2_willys
    Joined: Sep 8, 2007
    Posts: 4,331

    d2_willys
    Member
    from Kansas

    It all depends on how the dash indicators are wired. Your 33 is what brand name? I say this as I have a 59 Olds with a strange way of grounding the indicators. What they did was to use the opposite front turn signal to ground the indicator showing the intended turn direction. What ended up happening was with a 3 prong flasher (for incandescent bulbs), the center prong is used to provide flashing 12v to the indicator. But most 3 prong flashers have the center prong active when the L prong (for the signals themselves) is inactive. With this, both indicators iluminate at the same time, because of difference between the center and the L prongs. Now in your case, it sounds similar. I would check the indicators and how they are wired.
     
  7. Moriarity
    Joined: Apr 11, 2001
    Posts: 36,073

    Moriarity
    SUPER MODERATOR
    Staff Member

    Moved to the off topic forum
     
    hrm2k likes this.
  8. Doublepumper
    Joined: Jun 26, 2016
    Posts: 1,734

    Doublepumper
    Member
    from WA-OR, USA

    They are six ohm, fifty watt resistors. I found them on Ebay.

    Added to the front, as it was easier to access the wiring and mount the resistors. Two resistors, one for right signal light circuit and one for the left light circuit.
     
    BJR likes this.
  9. mixerman
    Joined: Jun 23, 2021
    Posts: 181

    mixerman
    Member

    The wiring harness is from "Hotrodwires" the flashers are two prongs. I replaced the e-flashers with a led replacement and they work perfect. I replaced the turn signal flasher with a two prong with a third ground wire and got them to flash, but I'm getting a crossfeed thru the led dash blinker indicator lights. I just got thru reading where if you replace your incandescent blinker indicators with leds you need to add a diode to the indicators to prevent a crossfeed.

    I have a set of incandescent blinker assemblies that I wired up and everything works perfect, so I assume wiring is correct.
     
    Last edited: Aug 2, 2025 at 8:17 PM
  10. mixerman
    Joined: Jun 23, 2021
    Posts: 181

    mixerman
    Member

    Thanks, I wasn't sure where to put it....thanks again
     
  11. Moriarity
    Joined: Apr 11, 2001
    Posts: 36,073

    Moriarity
    SUPER MODERATOR
    Staff Member

    In the future if it wasn’t around in 1965 post it in off topic
     
  12. mustangsix
    Joined: Mar 7, 2005
    Posts: 1,521

    mustangsix
    Member

    I would also check to make sure you have good grounds on those lamp housings. LEDs do odd things that incandescent lamps don't because they will react to very low current.
     

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