Turn signal failure

Discussion in 'Electrical Systems' started by JD Z, Oct 14, 2020.

  1. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Try replacing just the rear bulbs with incandescent bulbs and see what happens.
    Something seems weird with the rear LED bulbs if they don't come on at all.
     
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  2. JD Z

    JD Z Veteran Member

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    Great question. I put incandescents in the rear turn signals and all works as it should with the headlights on and off. I replaced the rears with LED and tried the same on the front with incandescents. Same result. I left one incandescent in on the left front turn signal with LED in the right front turn signal. The left side with the one incandescent works with headlights on and off, but the right side has the same problem.

    Worst case, I can leave incandescents in the front turn signals. My goal was to brighten up the rear lights as they were pretty dim. Looks great with LED. That said, I’m hoping to track down this problem and go all LED.
     
  3. Oldskool62

    Oldskool62 Veteran Member

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    Funny I replaced the headlights globes with LED H4 replacements and have exactly the same issues. All the rest of the bulbs are stock.
     
  4. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Your flasher apparently needs more resistance in the circuit to function.
    (A single incandescent bulb seems to make them work.)

    Which flashers did you get?

    You may be able to can add a resistor to the turn signal circuit to maker the flasher happy but I haven't seen anyone need to resort to that... Yet.
     
  5. JD Z

    JD Z Veteran Member

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  6. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    Read the reviews on that flasher.
    Several people have reported problems with that particular flasher when using LEDs. (on Amazon)

    Sorry if I led you astray with that. I read the description and it seemed like it should be the correct one.
    Someone else needs to chime in to find what actually worked with a full set of LED lights.
    I've only done the interior ones myself.
     
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  7. JD Z

    JD Z Veteran Member

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    I’ll try the load resistors next. Watching YouTube it looks like they are a key to LED conversions.
     
  8. JD Z

    JD Z Veteran Member

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    Good news. The LED lights are all working. I installed the load resistors on the front turn signals and that did the trick. For a 1980 Camaro, the three wires to the front turn signals are Green, Brown and Black. The load resistors are connected to the Green and Black...the two outside wires of the three.

    In the process, I did replace both flashers with an electronic flasher noted above and put non-polarity LED’s in. I put LED headlights in and all external signals are LED except the front yellow side lights. The LED was too bright there. The rear corner side lights are ok LED. The key I think is merely the load resistors and I only needed to put those on the front turn signals. I hope this helps the next individual searching for answers.

    The dash LED’s are on my list to do soon. Thank you for you guidance and help. Much appreciated.
     

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