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Battery goes dead at times

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Old 09-07-2010, 09:12 AM
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MO Battery goes dead at times

Just had this happen for the second time since I bought the car used in April. Go out to start the car after it had been in the garage for about a week and the battery was totally dead. The first time I determined it was due to the battery being old and it had a shorted cell as confirmed with a battery tester so I replaced the battery. To my knowledge none of the lights were left on, at least they weren't on when I put the battery charger on the car. Nothing was turned on that I could tell. Has anyone else had this happen to them before?
Old 09-07-2010, 11:29 AM
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Check the "dark current" draw as well as the charging system.

Last edited by EDZRIDE; 09-07-2010 at 03:53 PM.
Old 09-07-2010, 11:45 AM
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MO

Originally Posted by EDZRIDE
Check the "dark current" drraw as well as the charging system.
I think I understand what you mean by "dark Current" draw (base current needed to hold CPU data, etc) but not sure how I would check that. Also, the charging system appears to be working properly but will do a double check on it this evening when I get off work.
Old 09-07-2010, 01:08 PM
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pull the pass thru open and make sure the trunk light is out with the trunk closed.
Old 09-07-2010, 02:19 PM
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Alternator could be a possibility as well
Old 09-07-2010, 03:53 PM
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Originally Posted by bschnard
I think I understand what you mean by "dark Current" draw (base current needed to hold CPU data, etc) but not sure how I would check that. Also, the charging system appears to be working properly but will do a double check on it this evening when I get off work.
Do an advanced search on "dark current; quite a bit of info there.

What is the charging rate? Should be 14.25 volts; don't forget to check the belt tension too.

Last edited by EDZRIDE; 09-07-2010 at 04:00 PM.
Old 09-07-2010, 07:36 PM
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dont forget the glove box light... check that one as well.
Old 09-08-2010, 08:19 AM
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Originally Posted by zoom44
pull the pass thru open and make sure the trunk light is out with the trunk closed.
You win the prize, the trunk lid had not latched fully and the light was on. Thanks for thinking to have me open the pull down, I had even forgotten that was there.

Thanks everyone for all of your ideas.
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