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Dim LED bulbs with ignition off

Discussion in '1st Gen. Tacomas (1995-2004)' started by Cheesycook, Sep 18, 2009.

  1. Sep 18, 2009 at 11:09 PM
    #1
    Cheesycook

    Cheesycook [OP] Geek with a gun

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    Someone mentioned previously that this was a known issue. I just replaced my interior light bulbs with led bulbs. It is great to have a directed light so my map light isn't shining in my eyes. When the ignition is on it works perfectly. With the ignition off I just get a dim glow out of the bulbs. Does anyone know what causes this apparent change in voltage?
     
  2. Jan 22, 2010 at 11:47 PM
    #2
    johnyt2

    johnyt2 Active Member

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    I have the same problem. Let me know when you figure it out.
     
  3. Jan 23, 2010 at 12:10 AM
    #3
    Cheesycook

    Cheesycook [OP] Geek with a gun

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    Ended up going to a gel coated standard bulb. nowhere near as bright when the motor is on but it works. Was thinking of using a relay for full power but don't have any time on my hands.
     
  4. Jan 23, 2010 at 12:19 AM
    #4
    bmgreene

    bmgreene Well-Known Member

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    Alternator puts out around 14V when it's working properly, fully charged battery only puts out 12V. This is the case for pretty much any car since the alt voltage has to be higher than the batt voltage for the battery to recharge off the alternator.

    The apparent difference in voltage is an actual difference, and it's perfectly normal since the alt voltage is where the electrical system is at when the engine is running, but when it's off you're drawing from the battery.

    LED lights for auto use should be set to work fine at 12V, though
     
  5. Jan 23, 2010 at 12:33 AM
    #5
    Cheesycook

    Cheesycook [OP] Geek with a gun

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    True but Toyota set these dome lights even lower during an ignition off scenario as a dimmer light. So low that the LED lights only flicker at best.
     
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