Parasitic Draw Test
WARNING: This page is about a different car, the 2003 Ford Windstar and 2002 Ford Windstar. However, it is still accessible from the selected car via links, so may be relevant.
Connect ammeter to battery negative cable according to tool manufacturer's instructions. With all accessories off, doors closed and key out of ignition, current drain should be less than 50 milliamps. To locate cause of current draws greater than 50 milliamps, remove fuses one at a time until draw has been located. Repair appropriate circuit, and check system operation.