If your 2004 Ford explorer won’t start and there’s no clicking sound, given your battery was recently replaced, some would assume this problem is the starter or the starter solenoid. But let’s just see if an easier, cheaper solution might help first:
If these things don’t work, you may be looking at a more challenging (and possibly more expensive) issue:
Unless you’re handy and experienced with DIY car projects, you may need help from a professional mechanic. They’ll have diagnostic tools and experience to help them find and correct the problem. But we’re hoping the issue boiled down to one of those easier solutions and you’re good to go now!