Battery problem or phantom drain? Need help diagnosing...

Discussion in '100-Series Cruisers' started by KY Tundra, Mar 14, 2018.

  1. KY Tundra

    KY Tundra

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    I have to confess, this is for my Tundra, but I like this forum more than any other, and I assume the tech is the same. I have a 2012 Tundra with about 60K miles. I'm on the second Toyota Battery. If the truck sits with the engine off, doors open so interior lights are on, for more than 10 mins or so, the battery dies (like when you are cleaning the interior of the truck). Has also happened sitting in the truck with the key on, radio on, but again for only several minutes. Its the same thing I have done in cars all of my life and never had a problem.

    I had the first battery replaced under warranty because I was having similar issues and it has continued.

    • With a multimeter, how do I insure there is nothing draining on the battery when everything is off?
    • Does the Bluetooth on the radio "scan" and cause extra drain on the battery?
    • Anyone else had a similar issue? I want to blame it on the Toyota battery, but we have the same in our 100 and don't have any problems with it.
    Thanks!
     
  2. outdoorsman

    outdoorsman

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    First I would have a load test done on the battery. Any local auto parts store will do it for free. This will tell you if the battery is good or not.

    The way you check the amp drain. Disconnect the battery terminal and use a meter between the battery and the terminal you just removed with the meter set on the amp setting.

    When the key is turn on power is applied to lots of circuits. If you find a high power drain when the key is on you can pull fuses one at a time until you see a big drop on the meter.

    That will tell you which circuit you might have an issue with.
     
  3. KY Tundra

    KY Tundra

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    Thanks! I'll give it a shot.
     
  4. Spike555

    Spike555

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    IMG_1346.PNG

    It do not know if this is useful to you or not. But it just might be worth looking into. This is from another facebook page that I'm on, this guy works for Jaguar/Land Rover.

    When did this problem start compared to when you replaced the battery? Right away? A year later?

    I'm just throwing things at the wall here and sharing as much info as I can.
     
  5. KY Tundra

    KY Tundra

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    I feel like this has happened intermittently since the truck was new. Before and after the new battery.
    ee
     
  6. Spike555

    Spike555

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    Maybe pay attention to the run time when this happens?
    Like you drove it a mile to get cleaning supplies, then a mile home and started detailing your truck but it only ran for 10min but then the battery dies.
    Or you drove it for half hour, sit watching your kids t-ball game listening to the radio and the battery dies.

    I have no real help to give, like I said, I'm just throwing ideas at the wall to see if anything sticks.
     
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