You need to go to an auto shop that specialize in electrial wiring.Something is shorting your fuse to blow.Have you installed a cd player or radio recently yourself.You have a hot wire touching somewhere? What size car fuse are you using? Check that out.Is it the same amp as mention in the car manuel?
Sounds like you have a short somewhere. Make sure your fuses are all theRight Ratings. Also if you installed anything electrical, you may not have a ground somewhere. One otherthing could be Intruders. where i live we commonly have Mice or Squirrels nesting in the cars, especially if it sat for awhile.