Yep alternator, same exact problem mine even spiked to 17 volts may have been 19 once. trans fail safe and everything. i would just do the alternator, the regulator can be tricky

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2003 4.6is

2004 E53 4.4i N62 http://i.imgur.com/nNNg5Qz.jpg http://i1238.photobucket.com/albums/...ps3xxtq5op.jpg
2007 E63 M6 S85 http://i.imgur.com/mSXK6ML.jpg
1984 Porsche 911 930 Turbo http://i.imgur.com/i9XUXOg.jpgg http://i.imgur.com/ZMGou51.jpg
1983 E21 320i [Sold] http://i1238.photobucket.com/albums/...psfd905353.jpg