What would keep making battery die

2006 DODGE CARAVAN
111,011 MILES
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KELLY38
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We have problems with the van, the battery keeps dying. We've had 3 brand new Interstate Batteries put in since May 2010.
Our mechanic cannot find any problems, other than battery issues.
The battery is good then 5 to 6 months later, click click sound.
Have to jump start it and it's fine for awhile, then same issues.
Advance Auto tested battery and alternator. Tested fine.
We do have alarm on car and now the automatic door locks do not work.
When you drive, over 18 mph they are suppose to lock automatically.
We have 2 sliding doors, neither lock with the auto key, you have to manually lock and un lock them.
The guy from Advance, thinks it could be a problem with a relay.
Can you help ?? Tired of being stranded.
Oct 18, 2011 at 3:11 PM
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ASEMASTER6371
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I think you have an overcharging issue that is boiling the battery and causing pre mature failure. you need another shop that can verify this for you.

is the alarm factory or aftermarket??

Roy
Oct 18, 2011 at 3:20 PM
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KELLY38
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thanks will look into that. and the alarm is factory.
Oct 18, 2011 at 3:31 PM
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ASEMASTER6371
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have them look at the body control to see if there is any commands for the locks.

Roy
Oct 18, 2011 at 3:32 PM
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KELLY38
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so could it be the alternator, even though it tested as being good ?
Oct 18, 2011 at 3:34 PM
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KELLY38
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ok thanks. for all of the help.
Oct 18, 2011 at 3:35 PM
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ASEMASTER6371
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good luck

Roy
Oct 19, 2011 at 1:33 PM
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RASMATAZ
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I think you have an overcharging issue that is boiling the battery and causing pre mature failure. you need another shop that can verify this for you.

is the alarm factory or aftermarket??

Sooner or later the battery will blow been there before
Oct 19, 2011 at 1:49 PM
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THIS IS MIKE
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We are glad to help.
Oct 19, 2011 at 4:41 PM