SkyTrak 6042 Service Manual - Manual (Page 379)

9.9 Model 6042 Legacy Origin 7/02
Electrical System
9.6 FUSES AND RELAYS
Fuses and relays help to protect the electrical system. In
general, a blown fuse is a symptom of another electrical
problem. Address the true problem, not just the symptom.
Simply replacing the fuse often will not solve the problem.
Blown fuses are usually due to simple causes, including
loose or corroded connections, or a defective relay.
There are two main causes of blown fuses: a shorted or
grounded wire in the applicable circuit, or a defective
electrical component. Visually check the condition of the
fuse, wires, connections and components in the involved
circuit before replacing a fuse. Check the circuit for
shorts, grounding or defective electrical components.
Keep in mind that many parts in the electrical system
work with components of the hydraulic system; a careful
inspection of the related hydraulic components may help
in solving problems.
For access to the fuse and relay panel, remove the four
screws (Fig. 9 -4, 1) securing the right side console
access panel (2) to the cab. The fuses (Fig. 9-5, 1) and
sealed 12-volt relays (2) are mounted under the right side
console access panel. The fuse and relay panels are part
of the cab harness.
Figure 9- 4 Remove the Right Side Console Access Panel
to Gain Access to the Electrical Fuse and Relay Panel
Figure 9-5 Fuse Panel
9.6.1 Circuit Protection - Fuses
The fuse is the most common method used for protecting
wiring circuits. A good fuse (Fig. 9-6, 1) will have the
center element connected to both sides of the fuse.
Whenever there is an excessive amount of current
flowing through a circuit, the fusible element will melt
(Fig. 9 -6, 2) and create an open or incomplete circuit.
Figure 9-6 Fuses
OH2430
1
2
7.5
20 10
10
10
10
10
7.5
40
40 OH2991
1
2
MT0420
1 2