Question about 2005 Cadillac STS

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(2005 cadi sts) I can drive this vehcile for months and, if I do not use it and, put it in the garage for a couple of weeks the battery drains. Ive had it in the shop and, the dealer could find nothing wrong. We went as far a unpluging the garage door opener thinking that the transmitter was turning on the cars brains.

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Sounds like the battery is a drain on it, check with an ammeter on the red or black wire to see how much. Shouldn't be over .2 A normally.

Also can try changing batteries, as when some batteries get old they do not hold a charge.

If you have the original battery, it's 5 years old.

Typically, batteries last 3 years on average.

Posted on Jul 05, 2010

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Posted on Jan 02, 2017

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1999 cad concourse, 75,000 miles, excellent shape. have had 3 or 4 times over past 6 months: engine wont turn over. (like a dead battery but put in new one last year). dash lights, horn,security,door...


This car might not get enough exercise. By that I mean there are things that are running all the time, remote entry systems, clocks, alarm systems. You may have a new battery, but it needs to be kept up to snuff. Sitting alone in the garage with NOTHING running, the battery will lose about 1% per month in ideal circumstances. As I said, your battery is powering all kinds of things while sitting in the garage so the drain is more than the 1% I mentioned. You may want to consider a trickle charger on this car if you are not able to drive it for at least 20 miles or more per week every week.

It seems your average mileage is just under 150 per week. I'm guessing you don't drive this car much on short trips, rather the bulk of your miles were highway on trips.

If I missed the boat on this question, please add a comment and I will try again.

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