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2011 Ford Flex battery drain

when it rain the and the car is not running and the doors locked the park lights, interior lights come on and kills the battery, pls.tell me what’s going on. this is a 2011 ford flex with 110,000 miles!

How old is your battery?Try cleaning both battery terminals and make sure they are tight.Sometimes, disconnecting the negative battery cable and leaving it off overnight could fix it.
See if problem is resolved.If not,see an independant mechanic because he has the tools and expertise to deal with electrical problems.

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