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New 12V battery but car won't start

Discussion in 'Gen 2 Prius Technical Discussion' started by Macky Hlaiki, Jul 18, 2023.

  1. Macky Hlaiki

    Macky Hlaiki New Member

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    I replaced the 12 v battery 6 months ago , I left the car sitting for few days when I tried to start it, the car was dead( no lights,) so I jumped up it. Took the car to check the battery , 2 places said the battery was good. This started happening very often like every other day, everytime I take the car to check the battery it comes out good no issue ( good battery) ( no check engine)
    Now the car will never start without a jump....
    Can u plz help me figure out the problem
     
    #1 Macky Hlaiki, Jul 18, 2023
  2. SFO

    SFO Senior Member

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    Welcome to PriusChat!!

    Recheck the replacement work, some of the connections might be loose or corroded, including where the ground straps at the body.

    FYI : you're moderated until you've posted 5 times.
     
    #2 SFO, Jul 18, 2023
  3. Macky Hlaiki

    Macky Hlaiki New Member

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    Thank u for the reply
    What do u mean by replacement work ??
     
    #3 Macky Hlaiki, Jul 19, 2023
  4. bisco

    bisco cookie crumbler

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    Sounds like you have a drain on the battery when the car is off
     
    #4 bisco, Jul 19, 2023
  5. Macky Hlaiki

    Macky Hlaiki New Member

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    Yes, but how do I find out were the drain is , there is no check engine light
     
    #5 Macky Hlaiki, Jul 19, 2023
  6. dolj

    dolj Senior Member

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    The work you did when you replaced the 12 V battery 6 months ago.
     
    #6 dolj, Jul 20, 2023
  7. Mendel Leisk

    Mendel Leisk Senior Member

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    Check the battery’s connections. With a volt meter, first check voltage between the two battery posts. Then check voltage between bare metal of the car body, and the jump start terminal in the fuse box in the engine compartment. If the second check shows much lower voltage there’s likely a poor connection in the wiring.
     
    #7 Mendel Leisk, Jul 20, 2023
    Doug McC likes this.
  8. Mendel Leisk

    Mendel Leisk Senior Member

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    #8 Mendel Leisk, Jul 21, 2023
    bisco likes this.
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