Battery test full charge but car dead nothing works. Could this be a fuse problem?

Hello, Check the connections to make sure the battery is connected properly, the connections are tight and clean, and then move to the fuse box. You will need to check the connection between the battery and the fuse box, and check the ground cable to ensure the battery is grounded. Afterwards, check your fuses in the cab and under the hood. I would expect you'll find one or more bad. Use a test light, it'll go quickly.