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Message: <blockquote data-quote="Einzee" data-source="post: 552873" data-attributes="member: 556176"><p>Your alternator is supposed to run your car.  With all accessories (A/C, power windows etc....) operating, the load should not exceed the output of the alternator.  Additional items like aftermarket driving lights, amplifiers and such were not calculated into the design of the vehicle.  These things will sporatically exceed the limits of the alternator and that's when the extra power that is needed is drawn from the battery.  The 13.5 and 14.4 are the common output voltages in American cars.  13.5 GM  14.4 Ford.  I'm not sure of the imports but they are within that range.  If you are wondering what your particular vehicle is running at, simply use your digital volt meter and connect it to your battery while your car is running.</p></blockquote><p></p>

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