How I found out my 12 volt was dead and my hack to get my car going

Discussion in 'Gen 2 Prius Technical Discussion' started by Kevin schroeder, Apr 11, 2019.

  1. Kevin schroeder

    Kevin schroeder New Member

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    I have a 2005 Prius . The other day my wife called said the car has no power it was showing the
     
  2. Kevin schroeder

    Kevin schroeder New Member

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    So we got the triangle of death and dead hybrid battery light and engine light all came on . I was thinking crap this will be expensive . I had a very large marine battery and jumper cables . So to see if it was the 12 volt and not the big hybrid battery I put my jumper cables on the battery in the trunk . Effectively making the Marie battery the replacement and when I turned the car on everything worked all lights went off . Except the check engine light .I drove the car for a long drive 30 min or so and came home turned off car and restarted all warning lights went off telling me it was the 12 volt . I drove to town bought a new 12 volt from my local shop . Everything is good. I noticed when I put the new 12 volt in my car did not run the gas engine as much I think it’s been trying to boost the tired old 12 volt for some time . Now the car works like new again and even stays charged with green light longer . Hope this can help someone
     
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  3. bisco

    bisco cookie crumbler

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    welcome and well done, thank you!(y)
     
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  4. edthefox5

    edthefox5 Senior Member

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    Don’t connect jump leads directly to the 12 volt battery in the trunk it’s very unsafe and a lot of work use the front under hood jump points.
     
  5. Kevin schroeder

    Kevin schroeder New Member

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  6. Kevin schroeder

    Kevin schroeder New Member

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    I was not trying to boost the car . I was trying to determine if it was the 12 volt was the problem and by putting a battery connected to the terminals will effectively be like I have replaced the battery and told me that was the problem and allowed me to drive my car to town and get the proper battery
     
  7. R-P

    R-P Active Member

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    Not pointed at OP, but at anyone reading this...

    And for gods sake, don't reverse the jumpleads.

    I do stupid stuff all the time, recovering from stigmata from a screwdriver I drove into the palm of my hand trying to open a 5$ screenwash-pump, so who am I to judge... but I cannot understand that people manage to hook up a black cable to the red "+" labelled jumppoint under the hood and also hook up the red cable to the chassis. But if you do this, there is several 1000$ of damage in a Prius. So don't.
     
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