need help badly

Where can you find a fuse diagram for a 1990 ford thunderbird if you do not have the box top that shows the diagram anymore?

which engine do you have, and which fuse box are you referring to - the one in the engine bay, or the one under the steering column?

which engine do you have, and which fuse box are you referring to - the one in the engine bay, or the one under the steering column? the one under the steering column and i believe it is a 3.8 v6 engine

Try asking for a Mitchell electrical manual for your year car at your local library. If they don't have it, they may be able to get it for you from another library. You could also try finding a cover with the diagram at the junk yard. Also, please remove your post in the Tech Help thread. I've described how to do it in the post above yours. Thanks.