SkyTrak 8042 Service Manual - Manual (Page 799)

Electrical System
9.208 Model 8042, 10042, 10054 Legacy Rev. 10/03
9.11 ELECTRICAL SYSTEM
COMPONENTS
Electrical components include warning devices such as
the indicators in the operator’s instrument cluster, horn,
back-up alarm, and other components such as the
various solenoids and all accessories.
Examine the appropriate wiring diagrams and schematics
earlier in this section, to help understand the wiring
circuits involved.
9.11.1 Warning Devices
Vehicle warning devices include the horn, instrument
cluster warning lights and the back-up alarm.
a. Horn
The horn (1) is mounted on the vehicle frame.
The horn sounds when the momentary-contact horn
button on the center of the steering wheel is pressed.
Removal of the horn button is discussed in Section 4.3.2,
a. “Steering Wheel Removal” of this manual.
The horn sound is produced by a solenoid-actuated
diaphragm in the horn that develops a resonating air
column in the horn trumpet, which is shaped to project the
sound. If the horn does not sound when the horn button
is pressed, check that the fuse is not blown.
Check for corrosion on the horn mounting that may be
preventing a solid ground, and check for a loose horn
wire. Test the horn switch for continuity when the horn
button is pressed.
If the problem is still not located, unplug the horn
connector (2), remove the nut attaching the horn to frame
(not shown) and test the horn using short, heavy-gauge
wires connected to a fused or otherwise protected 6-amp
minimum output, 12-volt DC power supply. If the horn
does not sound, replace the horn.
b. Warning Indicator Lights
(In Operator’s Instrument Cluster)
There are five subdued or “hidden” warning indicator
lights present in the instrument cluster (3). These warning
indicators illuminate during critical circumstances.
IMPORTANT: All five warning indicator lights demand
immediate attention and vehicle service. In many cases,
the vehicle should be shut down as soon as practical to
help prevent serious mechanical failure. Appropriate
service procedures for each circuit, as applicable,
appear elsewhere in this section of the manual.
c. Engine Coolant Temperature Warning Indicator
This indicator (4) is illuminated when the engine
coolant temperature is above 210° F (99° C).
An audible alarm will sound, and the engine
must be shut down as soon as practical to help
avoid engine damage. For additional information refer to
Section 9.8.31, “Engine Coolant Temperature Warning
Indicator Troubleshooting.”
d. Transmission Temperature Warning Indicator
This indicator (5) illuminates when the
transmission fluid temperature exceeds 250° F
(121° C). An audible alarm will sound, and the
vehicle should be stopped and the engine
allowed to run at high idle for five minutes.
If the light and alarm DO NOT cease after five minutes,
the engine must be shut down to help avoid transmission
damage. For additional information refer to Section
9.8.32, “Transmission Temperature Warning Indicator
Troubleshooting.”
MA7960
1
2
0000 00
P
OH1810
3
4
5
6
7
8
OH25202
OH25302