To protect the contact circuits of the vehicle's electrical equipment, various combinations of fuses, fuses and circuit breakers are used, most of which are concentrated in two mounting blocks (see Specifications).
Each individual fuse is used to protect a specific electrical circuit or several circuits at once. A label with an identification card for the placement of fuses in the mounting block is usually glued to the cover of the latter, from its inside.
The mounting blocks contain fuses of a compact design, equipped with bayonet contact terminals, and, if necessary, easily removed with fingers from their sockets in the block. In case of failure of any of the consumers of electricity, first of all, you should always check the condition of the corresponding fuse. Turn the key in the ignition switch to the ON position and, using a test lamp, probe the open terminals of each of the fuses. If the lamp lights up when connected to each of the terminals, then the fuse is good. If there is voltage only on the power supply side, then the fuse is blown. We also note that usually the fuse case is made of transparent plastic, through which it is easy to determine the state of the working jumper.
The fact that the contact jumper of a failed fuse burns out is easily detected by visual inspection of its translucent body
When replacing a blown fuse, make sure that the replacement fuse being installed matches the type of the fuse that came out of the element. Fuses designed for different rated currents may not physically differ from each other in any way, while not being interchangeable. Each of the electrical circuits has different operating parameters and needs a different degree of protection, so replacing the fuse (rated for a certain amount of current) not corresponding to it in terms of parameters is fraught with the most serious consequences (until the fire). Fuse operating parameters (rated current) usually marked on its plastic case.
If the new fuse also fails immediately after installation, it makes no sense to replace it further - first, the cause of the overload in the circuit should be identified and eliminated. In most cases, this is a short circuit of the connecting wiring, caused by damage to its insulation.