It really pisses me off when you are looking for a manual, Picture, Layout, and the information is tied to a cost or some other crap. Here it is Straight-up.
Many symptoms with parasitic drain on the battery, try disconnecting Fuse 38, it will only affect the Real Wiper which can intermittently fail and cause a death-power draw over a short time, even overnight.
Have you gone through a few batteries, only for it to come back? and maybe you shotgunned the alternator, even though they all checked out ok… ?
Try this and let me know how it went. 2004-navigator owners manual fuse layout pg 265 box is located in the Passenger side on the hinge side of the floorboards.