JLG 4013PS Service Manual - Manual (Page 172)

Electrical System
9-32 3508PS, 3509PS, 3512PS, 3513PS, 4008PS, 4009PS, 4012PS, 4013PS, 4017PS, 40.8, 40.9
5. Remove the lower dash panel.
6. Remove the hex nut securing the ignition key switch
to the dash.
7. Reach up and under the dash to work the ignition
switch and wiring out of the mounting hole.
8. Disconnect the ignition switch connectors from the
cab harness connectors, and remove the switch
from the machine.
b. Disassembly
DO NOT disassemble the ignition key 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 chart, 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 power (#30) wire to each of the following wires
in each switch position. Continuity should be present as
indicated in the following chart:
If all connections do not show proper continuity, replace
the ignition switch.
d. Ignition Key Switch Installation
1. Connect the ignition key switch to the cab harness
connectors.
2. Reach up and under the dash to work the ignition
key switch into the ignition key switch mounting hole
on the dash.
3. Secure the ignition key switch with the previously
used hex nut.
4. Install the lower dash panel.
5. Properly connect the battery.
6. Close and secure the engine cover.
7. Remove the Do Not Operate Tag from the ignition
key switch and the steering wheel.
9.14.6 Fuel Level Indicator and Fuel Level
Sender
a. Fuel Level Indicator Testing
1. The fuel level sender wiring harness leads can be
accessed from the top of the fuel tank. Disconnect
the fuel level sender wiring harness leads. With the
help of an assistant, touch both harness leads
together.
2. From the operator cab, have the assistant turn the
ignition key switch to the RUN position. DO NOT
start the engine. Observe the fuel level indicator
needle on the operator instrument cluster. When the
two wires are shorted, a full tank should be shown
on the fuel gauge.
3. Turn the ignition key switch to the OFF position. The
fuel level indicator needle should return to the
EMPTY position.
b. Fuel Level Circuit Tests
If the fuel level indicator is suspected of giving a false
reading, perform the following checks:
1. If the fuel level indicator needle does not move,
check the fuel tank for fuel.
2. Check for loose or defective wiring, faulty ground
connections or corrosion on the fuel tank sender and
wiring lead.
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
Switch Position Test for Continuity Between
Wire #30 and wires:
P #58
I #15
II #15 & #19
III #15, #17 & #50
MZ2140
0
P
I
II
III
MZ2130