When I bought my truck (used), the very next day it would'nt start. I had just cleaned up the battery terminals in the morning because they were a bit dirty. Thinking the battery was not the problem after making sure that it was charged, I replaced the starter. The dealer reimbursed me for the starter, but when I was leaving their lot after picking up the check, it would'nt start again. It turned out to be a loose battery negative cable. Oh well, at least I knew I would'nt have to worry about the starter any time soon (and it had a lifetime warranty). Remember, the terminal clamp may be tight on the battery terminal, but the cable needs to also be tight on the terminal clamp.