Help!!! Cranks briefly but won’t start

Discussion in 'Gen 3 Prius Main Forum' started by Bill Frederick, Jun 11, 2025.

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  1. Brian1954

    Brian1954 Senior Member

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    You should create a new thread for the problem with your car and not hijack this thread.
     
    #21 Brian1954, Jun 17, 2025
  2. Brian1954

    Brian1954 Senior Member

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    The answer to your question about the hybrid battery was in post #10.
     
    #22 Brian1954, Jun 17, 2025
  3. bisco

    bisco cookie crumbler

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    Try leaving it disconnected from the car for a few days.
    If it holds voltage, you have a short somewhere, draining the battery while the car is off
     
    #23 bisco, Jun 17, 2025
  4. Bill Frederick

    Bill Frederick New Member

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    So I have an update. I purchased a max pro grid charger. The charger was designed specifically for a GEN three Prius. I installed the wiring harness and tested to see if I installed it properly and everything looked good. I charged it for about 15 hours. Now the car won’t even crank at all. I have kept my 12 V battery charged as well. Any ideas? Is it possible that I missed something?
     
    #24 Bill Frederick, Aug 7, 2025
  5. ASRDogman

    ASRDogman Senior Member

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    Try disconnecting the wiring harness, and install things back to how they were without it.
    The first harness I had from the Prolong kit was defective.
     
    #25 ASRDogman, Aug 7, 2025
  6. Bill Frederick

    Bill Frederick New Member

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    I have uninstalled the wiring harness and there was no change. Still no crank at all now. I’m in the process of checking fuses but everything seems normal so far.
     
    #26 Bill Frederick, Aug 26, 2025 at 5:38 PM
  7. Bill Frederick

    Bill Frederick New Member

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    #27 Bill Frederick, Aug 26, 2025 at 5:42 PM
  8. Bill Frederick

    Bill Frederick New Member

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    IMG_2915.jpeg
     
    #28 Bill Frederick, Aug 26, 2025 at 5:45 PM
  9. ASRDogman

    ASRDogman Senior Member

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    #29 ASRDogman, Aug 26, 2025 at 5:54 PM
  10. Brian1954

    Brian1954 Senior Member

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    Use a meter and measure the voltage of the hybrid battery. Come back and post what the meter showed you.
     
    #30 Brian1954, Aug 26, 2025 at 6:26 PM
  11. Bill Frederick

    Bill Frederick New Member

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    So it was as simple as the safety switch. I did not click it over after reinstalling it. I discovered my error right before I read your post. Car started right up and seems to be running ok right now. I’ll continue to monitor everything. Thanks for all your help. I’m ok with doing something stupid so long as it’s running
     
    #31 Bill Frederick, Aug 26, 2025 at 8:01 PM
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  12. ASRDogman

    ASRDogman Senior Member

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    Always go with the simplist things first.
    See post #19...

    But I am glad it's running! Great feeling isn't it?

     
    #32 ASRDogman, Aug 26, 2025 at 8:07 PM
  13. Bill Frederick

    Bill Frederick New Member

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    Indeed it is!!! I haven’t needed the vehicle so it’s nice to get it out of my garage :) thanks again
     
    #33 Bill Frederick, Aug 26, 2025 at 8:19 PM
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