I WAS FULLY STOPPED AND TURNING LEFT AT A STOP LIGHT ON A CITY STREET, THE LIGHT WAS GREEN, I WAITED FOR TRAFFIC TO CLEAR. DURING THE MIDDLE OF THE LEFT TURN, I LOST STEERING FUNCTION: WHILE I TRIED TO TURN LEFT, THE VEHICLE VEERED RIGHT. THE RIGHT WHEEL STRUCK THE CURB. THE VEHICLE WAS THEN TOWED TO A FORD DEALERSHIP. THE LOWER CONTROL ARM AND BALL JOINT TOTALLY SEPARATED. THE DEALER CLAIMS THIS HAPPENED DUE TO STRIKING THE CURB, BUT THIS IS NOT THE CASE, IT HAPPENED DURING THE LEFT TURN.