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Chrysler Repair/town & country battery drains

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Question
my mothers van wouldnt start. gave it a jump it starts. then it doesnt overnight. my thoughtr was the alternator. took to auto place for code reading they said alternator not good.
here is where big brother steps in and says it may be the ECM so how do i check that

Answer
Hi Cathy,
If the repair shop did a fault code check and identified the alternator as the problem then I would believe that if you saw them do the fault code check or test the alternator. The other thing you can do is drive it and look at the battery voltage gauge on the cluster and see where the needle is pointing toward and also look at the warning light for the battery which should to be "on" when you first turn the key to the 'run' position but have not yet tried the starter. If after you start the engine that battery light is still 'on' or glowing even dimly then that would corroborate the charging system (alternator) is not putting out the necessary voltage to maintain the charge on the battery.
The ecm idea would need to be corroborated by a fault code readout that pointed toward the ecm, so I wouldn't go down that path without a confirmatory code that it is faulty. It is too expensive to just guess that the ecm is the problem.
Let me know what you observe and tell me the year and engine size (L) of the minivan if you send a follow-up question.
Please read the PS (below) and respond to it.
Thanks for doing that.
Roland

Chrysler Repair

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Roland Finston

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Get a Free Fast answer to your repair question about a Chrysler/Dodge/Plymouth car, minivan, SUV, or truck. Problems with electronically controlled engines and transmissions as well as body wiring problems are my specialty. This free troubleshoot advice forum helps you diagnose faults, minimize repair costs or do-it-yourself.

I answer questions seven days a week and respond to you in about 30 minutes. "Maxed Out" means I am answering another question, briefly unavailable, or asleep overnight, so try again later.

I have do-it-yourself experience (50+ years) and a library of 100 1982-2012 Chrysler factory shop manuals and 20 multi-manual Chrysler Corp. CD's.

I was voted "Top Expert" 2010-2015, here at AllExperts, and have answered 20,000+ questions.

Experience

Five decades as a 'do-it-yourselfer' on domestic and imported cars.

Organizations
Yahoo Autos Group called The Chrysler Lebaron Club (co-moderator)

Education/Credentials
Advanced degrees in Physics/bruised knuckles

Awards and Honors
"Top expert" of 2010, 2011, 2012, 2013, 2014 and 2015 here at Allexperts. Quickest "average response time" at Allexperts (currently no. 1).

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