Question about 2004 Pontiac Montana

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2004 Pontiac Montana -brand new battery, new alternator(not rebuilt). have to jump start and runs for a while then dies some times wont take charge. battery will die not running in a day. very intermi

Car stays running taking battery lead off . Are there any relays/switches that I am missing here. Have new ignition module to try for s and giggles.

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  • Pontiac Master
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First, you can't and shouldn't test an alternator by disconnecting the battery cable while the engine is running. You run the risk of cooking the alternator and the computer. Thats how we used to test generators back in the last century.
Is the check engine light on when the engine is running ? Is the battery charge warning light on ?
There should be a fuseable link between the alternator and the battery that could keep the alternator from charging the battery.
The ignition module would have no effect on the charging system.

Posted on Aug 07, 2012

  • Kenneth Tull Aug 07, 2012

    First of all dude, I am from the last century- before computers were even put in cars! give me

  • Kenneth Tull Aug 07, 2012

    me a 350/350 and I can fix it all day! the check engine light has been on scince I bought the car as is all cars with over 100k miles lol. When It does hold a charge the battery light is on and off and on and then off,etc.fuseable link is ok.I meant to say body control module- which i think will be my next step. what are your thoughts pops!

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: 85 pontiac firebird wont stay running.

sounds like a weak coil pack

Posted on May 02, 2010

360dreamworx

Pete Schipansky

  • 314 Answers

SOURCE: 1999 pontiac montana battery wont hold

You dont need a computer. You need a new Body Control Module. Located under the center console but forward towards the dash. A very common problem with these cars. NOT A USED ONE....A NEW ONE. They are VIN specific.

Posted on Jul 22, 2011

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2 Answers

I just replaced battery and alternater but the battery died hile driving and once i jump the car it ill run for thirty seconds then die.


you've had the misfortune of getting a bad rebuilt alternator-sorry-they should give you another one -I hope its not hard to replace-Denny

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I assume it started with the jump, but when disconnected, it died again. If so, this means it is also not charging which likely means a new alternator.

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Sounds like your alternator has gone bad.  The alternator is responsible for charging your battery back up for you as you drive.  You can have this tested if you take it off and take it down to your local auto parts store.  Let me know if you have any other questions.  Thanks for rating my respones and for using FixYa!

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