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MAINTENANCE MANUAL
Kenworth SmartWheel Troubleshooting Guide
16
F. Marker Lamp Flash Does Not Work
F1. Symptom: Marker lights do not turn on
F1-2. Possible cause: Problem in marker light circuits.
F1-3. Possible cause: Bad dash switch.
Check
Result
What To Do Next
F1 -2A
Marker lamp wiring/ connections
leading to marker lights (ckt L3ML)
from power distribution box through
trailer cable.
Wires/connectors OK.
Go to
F1-2B
.
Wires frayed, broken, connectors
loose or unplugged.
Repair/replace wires or connectors.
F1 -2B
Continuity of ckt R3NC from dash
switch to electronics module (8-way
connector pin 3), and ckt R3ML from
dash switch to power distribution
box.
Circuit has continuity.
Go to
F1-3.
No continuity.
Trace circuits, check for broken wire
or bad connections.
Check
Result
What To Do Next
F1 -3A
Unplug marker lamp dash switch.
Check continuity from switch termi-
nal R3ML to R3NC when switch is
turned on.
Ohmmeter reads continuity when
switch is turned on.
Go to
F1-4
.
No continuity when switch is on.
Replace switch.
