My '97 Passport appears to have some weird electrical problem. At random times, the battery indicator will start to move in sync with the turn signal or show a drop with any other pull on the battery (lights, radio, etc.). More than once, I've been idling in the driveway with nothing on and when I pull forward on the turn signal as if to initiate the bright lights, the engine dies. The car has no problem starting. The alternator has been replaced once. Does anyone have any suggestions or starting points?