The general culprit for a 1 to 2 amp current drain seems to be either a CD stuck in the CD changer ( if you have one ) or the truck lamp or hood lamp remaining on after the aforementioned item is closed. Don't dimiss the possiblity of a battery which self discharges. The best way to test a battery is to measure the specific gravity. An auto parts store should have a cheap device to do this. If the battery was dry and you only added distilled water, the acid may be too weak. ttt
Resistance is Futile.