whats wrong with it..
OK, so how do you know the battery is good, what is the voltage?
Should be 12.4V, If so,and nothing happens when you put the key in and turn it, then I'd say you have a short to ground.
Looking for a Used Explorer in your area?
CarGurus has 71,146 nationwide Explorer listings starting at $1,000.
Search Ford Explorer Questions
Are you a UK consumer? CarGurus now has a discussion forum in the UK.
Ford Explorer Experts