Generator cartridge fuse. Junction block

Generator cartridge fuse

DESCRIPTION

A 140 ampere generator cartridge fuse is used on this model. The generator cartridge fuse is similar to other cartridge fuses found in the Power Distribution Center (PDC). This fuse has a color-coded plastic housing and a clear plastic fuse conductor inspection cover like other cartridge fuses, but has a higher current rating and is connected and secured with screws instead of being pushed onto male spade-type terminals.

The generator cartridge fuse cannot be repaired and, if faulty or damaged, it must be replaced.

OPERATION

The generator cartridge fuse is secured between the two B(+) terminal stud connection bus bars within the Power Distribution Center (PDC). This fuse protects the vehicle electrical system from damage that could be caused by excessive charging system output and/or excessive electrical system current levels resulting from a faulty generator or faulty charging system control circuits. If the current rating of the fuse is exceeded, the fuse conductor melts to open the generator output circuit connection to the PDC. If a generator cartridge fuse fails, be certain to completely inspect and test the vehicle charging system before replacing the fuse and returning the vehicle to service. Refer to Charging System in the index of this service manual for the charging system diagnostic procedures. Refer to Power Distribution in the index of this service manual for the location of complete PDC circuit diagrams.

Junction block

DESCRIPTION

Fig. 2 Junction Block Location

1 - FUSE ACCESS PANEL

2 - JUNCTION BLOCK

3 - INSTRUMENT PANEL

An electrical Junction Block (JB) is concealed behind the left outboard end of the instrument panel cover (Fig. 2). The JB serves to simplify and centralize numerous electrical components, and to distribute electrical current to many of the accessory systems in the vehicle. It also eliminates the need for numerous splice connections and serves in place of a bulkhead connector between many of the engine compartment, instrument panel, and body wire harnesses. The JB houses up to nineteen blade-type fuses (two standard- type and seventeen mini-type), up to two bladetype automatic resetting circuit breakers, and two International Standards Organization (ISO) relays (one standard-type and one micro-type).

The molded plastic JB housing has integral mounting brackets that are secured with two screws to the left instrument panel end bracket. The left end of the instrument panel cover has a snap-fit fuse access panel that can be removed for service of the JB. A fuse puller and spare fuse holders are located on the back of the fuse access cover, as well as an adhesivebacked fuse layout map to ensure proper fuse identification.

The JB unit cannot be repaired and is only serviced as an assembly. If any internal circuit or the JB housing is faulty or damaged, the entire JB unit must be replaced.

OPERATION

All of the circuits entering and leaving the JB do so through up to nine wire harness connectors, which are connected to the JB through integral connector receptacles molded into the JB housing. Internal connection of all of the JB circuits is accomplished by an intricate combination of hard wiring and bus bars.

Refer to Junction Block in the index of this service manual for the location of complete JB circuit diagrams.