1997 ford f250

i'm havin some trouble with my truck the alternator is charging the battary is charged up but when i run the truck for 2 days the battery
is dead any ideas?

well, try starting the truck and then take off the pos. battery terminal for about 3 seconds, see if the truck dies. If it does, and you alternator is good, replace the regulator. If it doesn't, just get a new battery and make sure nothing is draining the battery.