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Thread: LED dash lights

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  1. #1
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    LED dash lights

    I have LED warning lights on the dash, problem is, the alternator and oil pressure lights go out and I have oil pressure, but there is still a very faint light emitting from the LEDs.

    Any ideas why?

    I’m worried it will be an IVA issue in a few weeks time!!

  2. #2
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    Common with most LED's. I believe you can just add a Zener diode to stop the residual current. I have the same on some other lights so may try myself when the weather improves. No idea about the IVA though - good luck.

  3. #3
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    Never heard of them, the two lights are on a common live then switch to earth through the respective sensor.

    I guess I put the diode in the live feed?

    Anyone else fixed the issue with these?

  4. #4
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    Just fitted something like this to my turn indicator on my dash which had stopped working properly since upgrading to LED rear lights....
    https://www.ebay.co.uk/i/28325732870...SABEgKcgfD_BwE
    Crendon Chassis No.49
    Huddart FE428 + toploader

    Not listed in the Shelby Register.

  5. #5
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    Putting a diode in series is just hiding the symptom. The problem is a leak to earth.
    Cheers

    Myles D-W

  6. #6
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    This is what I thought, a diode controls the direction of current flow, but if there's an earth leak, how will a diode help?

    I thought if the current flowed the wrong way the LED won't light up anyway??
    Regards

    Craig Perry

    No, I'm not "repairing" it, I'm fine tuning its performance.

  7. #7
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    A diode is usually used to stop the current reversal when using servo motors. Not sure how it will help a LED.
    It just does....

  8. #8
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    Quote Originally Posted by cperry View Post
    This is what I thought, a diode controls the direction of current flow, but if there's an earth leak, how will a diode help?

    I thought if the current flowed the wrong way the LED won't light up anyway??
    A diode flows pretty much no current in the reverse direction. That's really their purpose. In the forward direction they flow current but you 'lose' around 0.7V so for the OP where the diode is glowing dimly another diode in series may appear to fix it.
    Cheers

    Myles D-W

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