2000 FORD EXPLORER XLS. DRIVING DOWN THE ROAD AT 25 MILES PER HOUR. VEHICLE RUNNING PROPERLY AND SMOOTHLY. SMOKE BEGAN BELLOWING FROM UNDER HOOD. STOPPED VEHICLE TO OPEN HOOD TO DISCOVER ENGINE FIRE. VEHICLE HAS REGULAR MAINTENANCE WITH FULL DIAGNOSTIC LESS THAN A WEAK BEFORE HAND WITH NO ISSUES. VIN NUMBER IS NOT PART OF CURRENT RECALLS. BAFFLED AS TO THE START OF FIRE. MAINLY BURNED THE MAIN ENGINE ELECTRICAL HARNESS. *TR