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The key was left in ignition over night in off position and now the car won't start. No dome or dash lights and horn. I checked battery with a voltmeter and shows 18 volts.

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closed as too broad by Zaid, vini_i, DucatiKiller, Pᴀᴜʟsᴛᴇʀ2, Fred Wilson Dec 14 '15 at 3:04

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

are you sure with 18 Volt? On 18 Volt your battery will be destroyed if you have not a truck – Aug 20 '13 at 9:34

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