2000 Mountaineer Power Problems!!!
 

one morning i started my truck and it acted like the battery was dead, so i figured the battery was going bad, so the next day i got the truck running and drove nearly all day, i shutdown the engine and tried to restart it in less than a minute and it acted as if the battery was low.... what should i do?

make sure the battery cables are secure. If they're loose, this may happen as well. Also, since it will crank, take it to the local parts place (autozone, oreilly, walmart tire lube express, etc) and have them test the battery on the truck. the testers they use can also test the voltage regulator, starter, and alternator. They will be able to verify if it really is the battery or not.