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 at 12:07 PM
  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 at 12:16 PM
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