THE ALTERNATOR CAUGHT ON FIRE. TRUCK HAS 62000 MILES ON IT. THE BATTERY LOW VOLTAGE CAME ON. AFTER THE TRUCK RAN FOR A MINUTE IT WENT OUT. I RAN THE TRUCK FOR TEN MINUTES. AFTER I PARKED THE TRUCK AND WENT INSIDE I COULD SMELL SOMETHING. WHEN I STEPPED OUT MY DOOR AND LOOKED SMOKE WAS ROLLING OUT FROM UNDER THE HOOD. I GRABBED THE EXTINGUISHER AND PUT IT OUT. I THEN SPRAYED IT DOWN WITH WATER TO COOL IT. IT TOOK SOME TIME.