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12 V battery replacement

Discussion in 'Gen 2 Prius Care, Maintenance and Troubleshooting' started by CathyO, Mar 31, 2015.

  1. CathyO

    CathyO New Member

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    I just replaced my 12V battery and now the car won't start. It will take a jump and show "ready" on the dash but as soon as the car is turned off, it won't start again - no lights, nothing. Any ideas. I checked some fuses and they looked fine.
     
    #1 CathyO, Mar 31, 2015
  2. Mylar

    Mylar Member

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    Is the new 12-volt battery fully charged? Did you reconnect the negative battery lead to the car?
     
    #2 Mylar, Mar 31, 2015
  3. ursle

    ursle Gas miser

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    By chance had the car been idle for a period?
     
    #3 ursle, Mar 31, 2015
  4. 69shovlhed

    69shovlhed Surly tree hugger

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    either you popped fuse(s), hooked something up wrong (or didn't hook it up), or the new battery is junk. go back and recheck your work. make sure all connections are tight. check the fuses and check the voltage at the battery.
     
    #4 69shovlhed, Mar 31, 2015
  5. bisco

    bisco cookie crumbler

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    did u jump the battery or the charge point under the hoodie?
     
    #5 bisco, Mar 31, 2015
  6. mikefocke

    mikefocke Prius v Three 2012, Avalon 2011

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    Is the polarity of the battery the same as the one you removed? Meaning is the plus post on the same side and hooked to the same cable? In installing, did you disconnect the cable from a ground to the chassis of the car?
     
    #6 mikefocke, Mar 31, 2015
  7. wirelessjava

    wirelessjava Member

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    How much does this entirely cost?
     
    #7 wirelessjava, Apr 1, 2015
  8. Eclipse1701d

    Eclipse1701d Prius Enthusiast

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    To replace a 12V? About $200 plus your time. If you reverse jump the car? Potentially, thousands....
     
    #8 Eclipse1701d, Apr 1, 2015
  9. N.J.PRIUS

    N.J.PRIUS Member

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    When I had to change out my 12v battery (not being mechanically inclined at all) Toyota dealer charged me $290. I thought that was high, however, it was done right and any problems I just take it back to them. I guess peace of mind in that respect.

    One of the tip offs that my 12v battery was going bad was that I had to reset my digital clock 3-4 times because it would not keep the correct time. After that it has been perfect since the new 12v.
     
    #9 N.J.PRIUS, Apr 1, 2015
  10. bisco

    bisco cookie crumbler

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    actually, $290. isn't bad for a dealer. some have reported over $400.
     
    #10 bisco, Apr 1, 2015
    N.J.PRIUS likes this.
  11. Easy Rider 2

    Easy Rider 2 Senior Member

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    But it WORKS when jumped to another battery.
    That rules out fuses and installed with the wrong polarity.

    Either......the connections are not good OR the new battery is dead, because it's defective or not charged.
     
    #11 Easy Rider 2, Apr 1, 2015
    Eclipse1701d likes this.
  12. lar.smith42

    lar.smith42 Active Member

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    Were did you get the battery. Is it a Toyota battery or a cheap battery. Cheap battery may be your problem. Just had mine replaced at dealer for $265.
     
    #12 lar.smith42, Apr 1, 2015
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