Fuses
Each individual fuse is used to protect a specific electrical circuit or several circuits at once. The identification card for the location of the fuses in the mounting block is usually placed on the cover of the latter, on its outer side.
The fuse boxes contain compact fuses with bayonet terminals and, if necessary, can be easily removed from their sockets in the box with your fingers. If any of the power consumers fails, the condition of the corresponding fuse should always be checked first. Turn the ignition key to the ON position and use a test lamp to probe the open terminals of each fuse. If the lamp lights up when connected to each terminal, the fuse is OK. If voltage is present only on the power supply side, the fuse has blown. Note also that the fuse body is usually made of transparent plastic, through which the condition of the working jumper can be easily determined.
When replacing a blown fuse, make sure that the replacement fuse you install matches the type of the element that has failed. Fuses rated for different nominal current strength may physically be no different from each other, but are not interchangeable. Each electrical circuit has different operating parameters and requires different levels of protection, so replacing a fuse rated for a certain current strength with one that does not match its parameters is fraught with the most serious consequences (including a fire). The operating parameters of the fuse (nominal current strength) are usually indicated on its plastic housing.
If the new fuse also fails immediately after installation, there is no point in replacing it further - first you need to identify and eliminate the cause of the overload in the circuit. In most cases, this is a short circuit in the connecting wiring caused by damage to its insulation.
Replacement
1. The fuse box layout diagrams are presented in Specifications to this Chapter.
2. In the engine compartment, the mounting block is located in close proximity to the battery; in the passenger compartment, it is on the left under the instrument panel.
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3. Remove the cover of the corresponding mounting block.
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4. Visually inspect the fuse to identify it and use a special clamp to remove it from its socket.
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5. Examine the condition of the contact terminals in the receiving socket of the mounting block, remove traces of oxidation, replace defective terminals.
6. Install a replacement fuse in place of the faulty fuse that matches the original in terms of parameters.
Note: A spare fuse kit is usually stored in the interior fuse box.
Fusible links
1. Fusible links are used to protect circuits in which, for some reason, conventional fuses cannot be used, such as the ignition system circuit, as well as for power circuits in which high-amperage current circulates.
2. The main set of fuse links is mounted in the engine compartment near the battery. The second group is located in the adjacent fuse/relay box.
3. If a fuse link fails, it is extremely important to determine the cause of the overload in the corresponding electrical circuit.
4. Failed fuse links of the usual type are not subject to restoration repair. Make sure that the replacement element fully corresponds to the failed one in its nominal characteristics.
Circuit breakers
Circuit breakers are used to protect components of the on-board electrical system such as headlights and electric motors for window lifters, door lock actuators, etc.
On some models, the circuit breakers automatically return to their original state after tripping. If the overload that caused the circuit breaker to trip was not episodic, the condition of the corresponding circuit should be checked without delay. After the fault has been eliminated, the circuit breaker returns to normal operation. Sometimes, the circuit breaker must be returned to its working state manually after the cause of the overload has been eliminated.
[Original version of the article on the website: mitsubishiman]