New battery, alternator charging at 14.8v, when I come to a stop all the lights dim, when on the gas every light flickers, even the LED readout on my radar detector. Auto zone tested battery, charging system, and starting system. Battery and charging system test good but the starting system fails. I'm not thinking starter yet, it's never failed to start the engine. Where does the voltage regulator reside? If there is a bad capacitor in the voltage regulator, wouldn't that be the cause. The system is unable to smooth out the a/c voltage with the speed of engine. Or maybe a diode.