Contents: Fuses ↧ Fusible links ↧
Fuses
The electrical circuits of the car are protected by fuses, circuit breakers (reverse current relay) and fusible links. The main fuse/relay box is located in the engine compartment; the design also provides for the presence of an additional unit, which is located in the passenger compartment under the left rear seat and (see illustrations).
3.1a. The main fuse/relay box is located in the engine compartment on the bulkhead; disconnect the retaining tabs and remove the outer cover
3.1b....which contains a diagram of electrical circuits, fuses...
3.1s....and also the inner cover, under which the fuses and relays are located
3.1d. Interior fuse/relay box, located under the left rear seat; remove the outer cover (which shows the diagram of the electrical circuits of the fuses)
3.1e....and also the outer cover...
3.1f.... under which the fuses and relays are located
Each fuse is included in a specific circuit. The diagram of the correspondence of fuses and circuits is shown on the block.
The blocks contain fuses of several sizes: miniature, medium and large. Fuses of all sizes have a similar design. Medium and large fuses are removed by grasping them with your fingers. Miniature fuses must be removed using pliers or special plastic tweezers, which are included with most units.
If any electrical device does not work, first check the condition of the corresponding fuse. The best way to check a fuse is to test it with a test light. Make sure there is voltage on the protruding contact terminals (see illustration). If voltage is present only at one contact terminal, a conclusion should be made about the unsuitability of the fuse. A blown fuse can also be detected by visual inspection (see illustration).
3.3a. All the proposals presented have a single rated current of 10A, but differ in size: on the left is a miniature fuse, in the center is a medium fuse, and on the right is a large fuse. When purchasing replacement fuses, match them to the elements being replaced in size and amperage
3.3b. When a fuse blows, the conductive element between the contact terminals is destroyed; on the left is a blown fuse, and on the right is a usable one
The new fuse must have the same current rating as the blown one. Although fuses of different amperage ratings are physically interchangeable, only fuses of the specified amperage rating should be installed when replacing them. Replacing a blown fuse with a fuse of a different rated current is highly discouraged.
Each electrical circuit requires protection by a fuse of a certain rated current. The calculated current value is indicated on the fuse body.
If a fuse blows immediately after replacement, determine and eliminate the cause of the blown fuse before replacing it again. In most cases, the cause is a short circuit in the electrical wiring, caused by a broken or exposed wire.
Fusible links
Some circuits are protected by fuse links. Typically, such circuits are usually in an open state, such as the ignition switch circuit.
The generator circuit fuse is located in the wire connecting this element to the battery; it is easy to detect (see illustration)
3.7. The fuse link is the connector of the wire going from the battery to the generator
The insert is a short piece of large-section wire with markings on its sheath "fusible link".
Before replacing the fuse, disconnect the negative cable from the battery.
Warning: On models with the anti-theft system, the anti-theft device must be turned off before disconnecting the battery cables (see the beginning of this guide).
It seems that the fuse link has a larger cross-section than the wire of the protected circuit. In fact, this is explained by the fact that the insert has thick insulation, but at the same time consists of several wires, the cross-section of which is smaller than the cross-section of the circuit wire. The inserts cannot be restored - if necessary, they are replaced with an element with similar characteristics. The procedure for replacing the fuse link is described below.
- a) Making a cut just behind the connector, cut the replacement insert out of the wire.
- b) Cut approximately 25 mm of insulation from the wire.
- c) Join the bare wires and push them into each other, then twist the connection (see illustration).
- d) Solder the twist using rosin solder.
- e) Completely insulate exposed wires with adhesive tape.
- f) Connect the negative battery cable. Make sure the restored circuit is working properly.
3.9 To replace a fuse link, cut out the damaged section, then connect the new link to the circuit by connecting and twisting the wires as shown in this illustration. After connecting the wires, solder the twists and wrap them with insulating tape
The article is reprinted from the website: CHEVYMAN.ru