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Put a voltmeter across the battery with engine running, and immediately after shutting it off, and one hour after shutting it off. Let us know what numbers you get.

Also, check fault codes: http://www.allpar.com/fix/codes/index.html
 

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There could be hard crust and scale on the inside contact surface of the battery terminals. If it is bad enough, it can actually cause 'no connection'.
By jumping the battery on the outside of the battery terminals, you are bypassing the bad connection.
Thanks, good point. I forgot the most obvious, and this happened to me once.
 
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