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Being an Instructor in Aircraft Electronics (Avionics) and an ex Radio Technician, the vast majority of electronic equipment labelled for use with 12 volts, with still work very well with 13, 13.8, 14 even up to 15 volts. The only exception to this would be VERY precise labratory equipment, which most of us wont have! As has been said, if you ever run a voltmeter over your cars battery while the engine is running, you will and SHOULD see voltages approaching 13.8 to 14.2 volts! If you not, your alternator charging circuit is defective and you will soon end up with a flat battery!
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