WHILE DRIVING AT HIGHWAY SPEEDS THE INTERIOR LIGHTS BEGAN FLICKERING ON THE DASH AND IN THE CABIN. APPROXIMATELY 45 SECONDS TO ONE MINUTE AFTER THE INITIAL DASH AND LIGHT ISSUES THE CHECK ENGINE LIGHT CAME ON AND A NOTICE OF BATTERY CHARGING FAILURE OCCURRED, WITHIN A FEW SECONDS OF THIS OCCURRENCE I BEGAN TO SLOW DOWN AND PULL OVER. THE ENGINE SHUT OFF BEFORE THIS COULD OCCUR. BY THE TIME I COAXED THE VEHICLE ONTO THE SHOULDER THE ELECTRICAL SYSTEM AND DOOR LOCKS WERE NO LONGER WORKING. SMOKE AND FLAMES BEGAN TO ENTER THE COCKPIT AND I IMMEDIATELY EXITED THE VEHICLE. THE INTERIOR OF THE VEHICLE WAS FULLY ENGULFED IN LESS THAN A MINUTE AND THE ENTIRE TRUCK, BED, AND GAS TANK SOON FOLLOWED. THE TRUCK WAS COMPLETELY CONSUMED AND IS NOW A TOTAL LOSS. *TR