SkyTrak 8042 Service Manual - Manual (Page 606)

9.15 Model 8042, 10042, 10054 Legacy Rev. 10/03
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 (1) securing the right side console access
panel (2) to the cab. The fuses and sealed 12-volt relays
are mounted under the right side console access panel.
The fuse and relay panels are part of the cab harness.
9.6.1 Circuit Protection - Fuses
The fuse is the most common method used for protecting
wiring circuits. A good fuse (3) 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 (4) and create an
open or incomplete circuit.
Fuses are a one time protection device and must be
replaced each time the circuit is overloaded. To
determine if a fuse is open (4), remove the suspected
fuse and examine the element in the fuse for an open
(break). If not broken, also check for continuity using a
DMM or a continuity tester. If the element is open or
continuity is suspect, replace the fuse with one of an
equal current rating.
OH2430
1
2
Fuse Types
Current Rating Amperes Color
Auto Fuses, Mini Fuses
1 Black
2 Gray
3 Violet
5 Tan
7.5 Brown
10 Red
15 Blue
20 Yellow
25 White
30 Green
Maxi Fuses
20 Yellow
30 Light Green
40 Orange or Amber
50 Red
60 Blue
MT0420
3 4