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Rapid discharge

Discussion in '4th Gen 4Runners (2003-2009)' started by gginpa, Mar 1, 2017.

  1. Mar 1, 2017 at 10:41 AM
    #1
    gginpa

    gginpa [OP] New Member

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    Greg
    Hershey, PA
    Vehicle:
    2005 SR5 4Runner
    2005 SR5 - Twice the battery completely discharged with the engine off. First time about 5 or 6 weeks ago after only sitting 30 or 40 minutes at a McDonald's. Last weekend after sitting for maybe an hour and a half. Battery was completely dead to the point where doors won't even unlock, no dome lights, nothing. Both times after a jump the battery recharged with a half hour or so of driving and fine ever since. Battery came with the vehicle that I bough used last year but believe it to be 4 or so years old at most. Toyota factory battery installed by a dealer. Neither occasion was in particularly cold weather either.
     
  2. Mar 1, 2017 at 10:58 AM
    #2
    jester243

    jester243 rabble rabble rabble

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    Dan
    Spokane, WA
    Vehicle:
    2016 4Runner Trail Premium w/ KDSS
    batteries can and will fail whenever they feel like it, cells go flat, plates can collapse also charging systems can fail. have the charging system checked and then have the battery tested as well. Do you know if there are any aftermarket electronics that have been installed, maybe causing the battery to have a constant drain.
     
  3. Mar 1, 2017 at 12:12 PM
    #3
    Toyojay

    Toyojay New Member

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    Jay
    ATX
    Vehicle:
    2009 SE 4WD
    285/70/17 KO2 - Dobinsons 3/2" UCA - 5100s @ 0
    Yep if its 4 years old I say its time. At best we get 3-4 years out of them here in my neck of the woods. Sometimes less. You can also check voltage across the posts if you've got a multimeter at home. If it reads low 12's to anything in the 11's its junk.
     
  4. Mar 1, 2017 at 12:17 PM
    #4
    brochacho

    brochacho New Member

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    This is what happened to me. Found the insulation from the power wire to my amplifier had melted against the engine, so the bare wire was touching the engine and it drained the battery. Happened twice before we figured it out.
     
    Bob likes this.
  5. Mar 2, 2017 at 4:39 AM
    #5
    gginpa

    gginpa [OP] New Member

    Joined:
    Feb 27, 2017
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    Greg
    Hershey, PA
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    2005 SR5 4Runner
    I do have a multimeter and also just bought one of the digital meters that plugs into the cigarette lighter. Both read anywhere from 12.8 to 14.0 depending upon how long the car's been running, etc.
     
  6. Mar 2, 2017 at 4:40 AM
    #6
    gginpa

    gginpa [OP] New Member

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    Greg
    Hershey, PA
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    2005 SR5 4Runner
    Thanks, I don't have anything like that in mine. Only thing that isn't stock is my Pioneer head unit and that connected up to the existing wiring of course.
     
  7. Mar 2, 2017 at 4:59 AM
    #7
    gginpa

    gginpa [OP] New Member

    Joined:
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    Male
    First Name:
    Greg
    Hershey, PA
    Vehicle:
    2005 SR5 4Runner
    Only aftermarket is my Pioneer head unit and a remote start that I had installed by Best Buy several months ago. There have been very cold mornings that the vehicle started perfectly and only those two occasions where it completely discharged within a relatively short time after having been run for a while.
     

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