JLG 534D-10 - Manual (Page 163)

9.15 534D-9, 534D-10 & 544D
Electrical System
3. If the fuel level indicator needle does not move after
the ignition key switch is turned to the RUN position,
use a test lamp to determine whether current is
flowing from the ignition switch to the fuel level
sender.
4. If the fuel level indicator does not move and a faulty
or defective fuel level sender in the fuel tank has
been ruled out, and in addition, wiring and
connectors have been checked and ruled out, the
fuel level indicator is defective and must be replaced.
5. Check that the ignition terminal has current and that
the fuse in the fuse panel is not blown.
6. Check for broken, shorted, frayed, disconnected or
damaged wiring between the fuel level indicator
wiring at the cab, fuse and relay panel, ignition key
switch, and from the fuel level sender on the fuel
tank through the wiring in the cab.
7. Check the fuel level sender. A defective fuel level
sender in the fuel tank may also prevent the fuel
level indicator from moving. Refer to Section 9.5,
“Electrical System Schematics,” for further
information.
9.11 GAUGES
9.11.1 Analog Gauges
The machine is equipped with an analog fuel level, oil
pressure, water temperature and battery voltage gauge.
a. Removal
1. Remove the battery negative (-) cable at the negative
battery (-) terminal.
2. Remove the four bolts holding the gauge panel,
unplug connectors from the harness on the backside
of the gauge panel and remove the panel from the
dash.
b. Disassembly
DO NOT disassemble the gauge. The gauge is not
serviceable. Replace the gauge if found to be defective.
c. Installation and Testing
1. Install the gauge in the dash. Install the gauge
bracket, lock washers and nuts. Connect the wire
connections.
2. Connect the battery negative (-) cable at the negative
battery (-) terminal.
3. Turn the ignition to the ON position to check the fuel
level. If gauge is not reading properly refer to Section
9.10.4, “Fuel Level Sender.”
4. Start the machine and allow the engine to warm to
check the engine water temperature.
9.12 DASH SWITCHES
Note: For information on the front windshield wiper, rear
window wiper and washer systems, refer to Section
9.8.1, “Windshield Washer Reservoir and Pump.”
9.12.1 Ignition Key Switch
a. Ignition Switch Removal
1. Remove the battery negative (-) cable at the negative
battery (-) terminal.
2. Remove lower access panel.
3. Remove the hex nut securing the ignition key switch
to the dash.
4. Reach up and under the dash to work the ignition
switch and wiring out of the mounting hole.
5. Disconnect the ignition switch connectors from the
cab harness connectors, and remove the switch
from the machine.
b. Disassembly
DO NOT disassemble the ignition switch. Replace a
defective switch with a new part.
c. Inspection and Replacement
To determine the proper operation of the ignition key
switch, using the following charts, test the wires on the
back of the switch for continuity with an ohmmeter.
Test the ignition key switch for continuity, by checking
from the ignition (Red - Battery) wire to each of the
following wires in each switch position. Continuity (X)
should be present as indicated in the following chart:
MX0740
240
100
F
E
100
0
16
10
TEMP
FUEL
OIL
VOLTS
- +