What could it be?????

:banghead: . My question this time is that i still have the same problem. at first it was thought to be the fuel pump. I am now on my third one. So I know that is not the problem. It is not my passlock. They tell me this time that it is because the battery has corroded, and started corroding the inside of the wires as well. Could this be the reason that my truck refuses to start????? I have no idea at this point, could someone else give me some insight on this problem? :banghead: