Where can I find a free fuse diagram for 2003 Ford Taurus online to correctly replace fuses that fell out of box?

There's a forum for Ford Taurus owners... I know this, because I used to own an old 94, and would go there for diagrams and such. Due to the website's policies, we're not supposed to post URLs in the answer text, but if you get on Google and do a search for "Taurus Club", the first result should be what you're looking for.

You will find that info in the owners manual that should be located in the glove box.