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Engine dies w/o battery power

Posted by BLACK'98DSM, Nov 17, 2019

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  1. BLACK'98DSM

    BLACK'98DSM Proven Member

    1,020
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    Hoover, Alabama
    Back a few months ago my negative cable popped off of the battery and when it did the engine completely died. Right away.

    I never really thought anything about it then, but according to the ASE guides an engine should be able to power itself without the battery. I find this to be true with cars from the 60's.

    Is there any reason why the 420a won't run without a battery (once started)? Or is there something wrong with mine? This would usually point to a bad alternator, but my battery does not lose charge.
     

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  2. Archer Fabrications

    Archer Fabrications Supporting Vendor

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    Joined May 9, 2011
    Scottsdale, Arizona
    A bad alternator, check the volts you are getting
     

    490  7

    2006 Evo 9 MR
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  3. Santi714

    Santi714 Probationary Member

    15
    10
    Joined Sep 29, 2019
    Cleveland, Ohio
    Change the battery fuse regardless of it testing good still..
     

    Street Build 187  4

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  4. ItsCuzImmaTURK

    ItsCuzImmaTURK Probationary Member

    30
    2
    Joined Nov 18, 2019
    Rochester, New York
    I’m having the same issue with my 97 gsx i picked up when it starts, it does a pull and completely shuts off, no dash lights and won’t turn over again, dash lights are really dim, i think the batteries dead, and alternator shot, gotta look into it
     
  5. Kai Hefner

    Kai Hefner Freelancer

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    Joined Jun 21, 2018
    Calgary, AB, Canada
    +1 on alternator. Car can definitely just run on the alternator I had a situation where I hit a few large bumps going a bit too fast and my trunk-mounted (unsecured) battery went flying. Car kept running for me to pull over and deal with it.
     

    Street Build 386  1

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

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    1998 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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  6. BLACK'98DSM

    BLACK'98DSM Proven Member

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    Hoover, Alabama
    But the alternator charges the battery, and my battery never dies. Sometimes I run the stereo for 15-20 mins with the engine not running, but it starts up every time. I will definitely test the alternator, maybe it's just weak and not failed yet.
     

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    fwd · manual · 2G DSM

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    2012 Murray Explorer Dune
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    rwd · automatic · Misc Vehicles
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  7. motomattx

    motomattx Proven Member

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    Joined Dec 9, 2010
    wampum, Pennsylvania
    The alternator could be putting out 12v-13v above say 2k rpm, but possibly nothing at idle speed, causing it to die at idle but not kill the battery out on the road.
     

    Drag Race Build 3K  24

    1995 Mitsubishi Eclipse GST
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  8. ItsCuzImmaTURK

    ItsCuzImmaTURK Probationary Member

    30
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    Joined Nov 18, 2019
    Rochester, New York
    Battery tested good, alternators shot, hopefully its not a pain to put back on LOL
     
  9. Santi714

    Santi714 Probationary Member

    15
    10
    Joined Sep 29, 2019
    Cleveland, Ohio
    It is jack the car if you don't have a lift and do it from underneath. Easiest way I found to do it.
     

    Street Build 187  4

    1995 Eagle Talon TSi
    fwd · manual · 2G DSM
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  10. ItsCuzImmaTURK

    ItsCuzImmaTURK Probationary Member

    30
    2
    Joined Nov 18, 2019
    Rochester, New York
    Yeah, i figured that out too, but now the car completely died on me while driving on the highway, now just keeps on cranking but no fire, even with cables hooked up
     
  11. Kai Hefner

    Kai Hefner Freelancer

    236
    98
    Joined Jun 21, 2018
    Calgary, AB, Canada
    Stop driving the car if something this major is wrong with it! :ohdamn:
     

    Street Build 386  1

    1995 Mitsubishi Eclipse GSX
    awd · manual · 2G DSM

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    1998 Eagle Talon TSi AWD
    awd · manual · 2G DSM
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