9.6 Lighting System – 9 Frame, Body, Cab and Accessories
Maintenance Manual Ottawa T2 4x2
9.6.15 Transmission
Shifter/Fifth-Wheel
Control and Panel Lighting
page
–
Diagnosis
Components
•
Electroluminescent Lamps
•
Incandescent Lamps
•
Headlight Switch
•
Parking Light Circuit Breaker 10A
•
Panel Dimmer Switch
Electroluminescence
Electroluminescent (EL) lamps consist of two wafer-thin pan-
els, one transparent and one opaque, that produce light when
energized electrically. The panels are separated by an ex-
tremely narrow space. If a lamp is pinched so that the two pan-
els come in contact, a short is created.
EL lamps require an inverter to change direct current to high cy-
cle alternating current and increase the voltage. A shorted EL
lamp will cause the inverter to shut down. To isolate the defec-
tive lamp, disconnect one lead to each lamp and reconnect one
at a time. A good lamp lights when connected.
Transmission Shifter/Fifth-Wheel Control and Panel Lighting Circuit Diagnosis
Observation
Cause
Action
Inoperative light
Defective lamp
Replace.
Defective dimmer switch
Replace.
Circuit breaker open
Reset. Repair short as needed. Re-
place circuit breaker as needed.
Defective wiring (or inverter)
Inspect connections and wires.
Test circuits. Repair or replace as
needed.
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