Kalmar Ottawa t2, Maintenance Manual

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0.8 Electrical Instruments – 0. Machine Complete 37
Maintenance Manual Ottawa T2 4x2
0.8 Electrical Instruments
page –
Guide to Troubleshooting
This guide is provided for diagnosis of problems in Kalmar elec-
trical instruments. The sequence presented is intended to min-
imize duplication. Follow the sequence as described to prevent
misdiagnosis. This guide presumes that senders and gauges
are properly matched and wired and that the correct voltage is
applied.
page –
Basic Gauge Cluster Diagnostic Procedure
Schematics and diagrams of the electrical circuitry appear in
Section E, Schematics.
The following steps describe the general path to follow when
troubleshooting electrical faults that show up on the instrument
panel.
1. On replacement parts, check the part numbers of the
gauge and sender to ensure they are matched, and match
the voltage in the vehicle (12 VDC or 24 VDC).
2. Inspect the wiring between the gauge cluster and sender.
Wiring should be intact and tightly connected. Tighten and
replace wiring as required.
3. If the gauge cluster still does not work, ensure that the steel
housing of the sender is properly seated.
Grounded Sender Test — Attach the sender wire from the
gauge to an established chassis ground. Momentarily apply
power. The pointer should move to the far right of the scale.
Remove power. If the gauge fails this test, replace the
gauge and retest.
4. If the pointer jumps rapidly, overshoots or oscillates around
the rest position, the sender connection contact is intermit-
tent. Trace the sender wiring and verify that the connec-
tions are secure. If connections are tight and in good
condition, replace the gauge cluster.
W A R N I N G
Ensure that the gauge cluster and senders are
matched and properly wired in circuits with correct
voltage. Failure to heed this warning could result in
personal injury and property damage.