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Battery Light goes on/Off/ headlights bright then dim

Discussion in '2nd Gen. Tacomas (2005-2015)' started by avanko, Nov 29, 2011.

  1. Nov 29, 2011 at 4:55 PM
    #1
    avanko

    avanko [OP] New Member

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    First Post...I have a 2005 Tacoma/access cab, 4 cyc, 2 wheel drive, 120,000 + miles. The battery light recently has been going on and off. It seems to be more noticeable when wet out or raining. Very wet today and have rain for a few days here in central Ohio. Today while I was driving home, I noticed it going on and off, I also noticed that the fan would speed up and slow down, and that the headlights were getting brighter and dimmer. Got home and left it running and noticed that the taillights were doing the bright/dim thing also. Got out my trusty volt meter and started checking voltages. At the battery with the lights on, I got 14+volts, turned off lights, i got 13+ volts, turned off engine, got 13+ volts.
    I'm sure that this is the original battery for the truck. Shined light into battery sight hole, green and good to go. The belt seems tight/fine good to go there. Any body know of anything that could help?

    I also would like to that TacomaWorld forum for the post about how to repair/clean/lube heater fan. First rate got me fixed right up, even though i am going to have to replace motor when brushes wear out (got almoust 1/4" left. Also thanks to the guy who posted about the windshild whistle, didn't know where that was comin from! God that noise could drive a man crazy.
     
  2. Nov 29, 2011 at 5:02 PM
    #2
    NelsonTacoma

    NelsonTacoma This is my derpawayinator!!!!!

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    This is what i was thinking too. That would be the first place to start. Time to get your alternator tested.
     
  3. Nov 29, 2011 at 5:11 PM
    #3
    ForeRunner

    ForeRunner Scotch before noon. Moderator

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    Wondering if it's a loose connection.
     
  4. Nov 29, 2011 at 6:08 PM
    #4
    mistergasser

    mistergasser Member

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    check that alternator belt is not slipping under electrical load of headlights
     
  5. Nov 29, 2011 at 6:52 PM
    #5
    wrxRome

    wrxRome Houston's Swamp Rat

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    Check the nut under the grey cap is tight. Mine was lose and gave me the light also.
     
  6. Nov 30, 2011 at 7:01 PM
    #6
    Large

    Large Red

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    Look at the battery terminals, clean them pretty thoroughly with contact cleaner and a wire brush. Check your battery with a volt meter, you should get about 12v DC, sometimes more sometimes it's less by a tad. Have autozone check it for free too.
     
  7. Nov 30, 2011 at 11:15 PM
    #7
    LGE RAW

    LGE RAW Well-Known Member

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    Take it by a local auto parts store or a Sears and have it load tested. They do it for free.
     
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