1 - Good fuse
2 - Burnt out
The electrical circuits of the vehicle are protected by a combination of fuses, circuit breakers and fuse links. A blown fuse is easy to distinguish from a good one by examining its transparent plastic case. Carefully inspect the fuse for a blown fuse. If the fuse looks normal on the outside, but suspicions of its malfunction have persisted, check the continuity between the knife terminals protruding from its body.
When replacing fuses, make sure that the replacement fuse matches the old type. Fuses designed for different amperages may look identical in appearance, so special attention should be paid to the marking. Replacing a blown fuse with one designed for less - and especially more - amperage is undesirable. Each electrical circuit needs a different degree of protection. Make sure that the marking on the fuse body corresponds to the current strength for which the corresponding circuit is designed.
If the replaced fuse blows immediately, it is not wise to continue replacing it. First you need to identify and eliminate the cause of his knocking out. In most cases, this turns out to be a short circuit in the wiring of the circuit, caused by a break or damage to the wire insulation.