The position of each fuse is marked on the fuse box, indicating which circuit it is protecting. But at the same time, designations such as BACKUP, CCON or IG1 may not explain anything to you. A fuse can control current in more than 1 circuit, i.e. in multiple connected circuits. The location of the wires and fuses must be maintained. If each circuit has its own fuse, the fuse box will be huge.
The fuse box under the dashboard and under the hood has a special fuse extractor that can be used to grab and remove the fuse. The fuse inside the fuse box cannot be checked, for this it must be removed. Examine the fuse from different sides, looking for a broken element in the center. Sometimes it is difficult to identify a breakdown. If you can't test the fuse with an ohmmeter for continuity, it's best to replace the fuse. If the fuse has melted, turn off the ignition. If the new fuse melts immediately, the circuit should be checked for a short circuit, damaged insulation, or a loose contact.
DO NOT use fuses with a higher current rating than recommended.