Question about 2002 Pontiac Montana

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Battery go's flat when engine turned off - 2002 Pontiac Montana

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The Battery is JUNK.
I presume from your comment that you have to jump start it each time you wish to go anywhere?
Or is your information, not precise enough, as to what does and does not happen?
Come back to me?
Regards,DT

Posted on Sep 06, 2009

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Charge the battery--then remove the negative battery terminal. Scratch the terminal over the battery post--lots of sparks (everything turned off) mean something is shorting to ground. Remove the alternator heavy wire connection and cover the wire end with a towel or paper to insulate it from ground. Retry the negative battery terminal again as before--no sparks, replace the alternator (shorted diode). If still sparks, reconnect the alternator wire, then check for hidden lights that are on (glove box, under hood light). If still get sparks, start pulling and replacing fuses, while checking for sparks each time a fuse is out. At some point, you should find the fuse that controls whatever the short/load is in.

Posted on Sep 06, 2009

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