SkyTrak 6036 Service Manual - Manual (Page 451)

9.99 Model 6036 Legacy
Electrical System
b. Fuel Level Circuit Tests
For additional information refer to Section 9.9.7, “Fuel
Level Indicator Troubleshooting.”
If the fuel level indicator is suspected of giving a false
reading, perform the following checks:
1. Check for loose or defective wiring, faulty ground
connections, and corrosion on the fuel tank sender
and wiring lead.
2. If the fuel level indicator needle does not move after
the ignition key switch is turned to the RUN (Fig. 9-97)
position, use a test lamp to determine whether
current is flowing from the ignition key switch to the
fuel level indicator wiring connector behind the
operator’s instrument cluster. (The instrument cluster
locking ring can be unfastened and raised slightly to
do this.)
If the fuel level indicator needle (Fig. 9-95, 1) does
not move, check the fuel tank for fuel.
If the fuel level indicator does not move and a faulty
or defective fuel sender in the fuel tank has been
ruled out, and in addition, wiring and connectors
have been checked and ruled out, the operator’s
instrument cluster is defective and must be replaced.
3. Check that the ignition terminal has current and that
the fuse in the fuse panel is not blown.
4. Check for broken, shorted, frayed, disconnected or
damaged wiring between the fuel level indicator
wiring at the operator’s instrument cluster, fuse and
relay panel, ignition key switch, and from the fuel
sender on the fuel tank through the wiring in the cab.
5. Check the fuel level sender. The resistance of the
fuel sender is 31 ohms for a full tank of fuel, 101 ohms
for 1/2 tank and 255 ohms for an empty tank. A
defective fuel level sender in the fuel tank may also
prevent the fuel level indicator from moving.
Excessive fuel level indicator “fluctuation” may be caused
by loose wire connections or a defective fuel sender in the
fuel tank.
A full tank reading at all times may occur if the wiring to
the fuel sender in the tank is broken, if the sender is not
properly grounded or if the sender is defective.
If the fuel level indicator appears to be inaccurate, the fuel
sender in the tank may be defective, or there may be low
voltage at the fuel level indicator connector to the
operator’s instrument cluster.
If the fuel level indicator fluctuates when other electrical
items are used, there may be a defective, corroded or
improper ground. Check the cab harness ground stud
under the dash, the engine to chassis ground, and the
negative (-) battery cable and ground stud cable.
9.15.15 Hourmeter
The hourmeter (Fig. 9-98, 1) is a non-repairable
instrument that records hours of vehicle engine operation
in tenth of an hour increments and is located in the
instrument cluster.
The hourmeter is an analog device, similar to an
odometer, and will display 99,999.9 hours before
resetting to zero.
If trouble is suspected, time the hourmeter for six minutes
to verify that a tenth of an hour has been recorded.
The hourmeter is built into the instrument cluster and
cannot be repaired. If the hourmeter is suspect, replace
the instrument cluster.
Figure 9-98 The Hourmeter is Located
in the Instrument Cluster
0000 00
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MA7640
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