Why does your 2002 Grand Marquis constantly blow fuse number 16 while still under warranty?

I DONY KNOW WHY THE FUSE BLOWS BUT I CAN TELL YOU TO RETURN THE CAR TO THE DEALER FOR REPAIR. IF YOU CAN NOT GET THEM TO FIX OR THEY CAN NOT FIND THE PROBLEM CALL FORD CUSTOMER SERVICE AND TELL THEM YOUR PROBLEM. YOU MAY ALSO WANT TO WRITE A LETTER FOR A RECORD ON FILE BEFORE WARRANTY EXPIRES