Exterior Light Controls
Important: Unless otherwise noted below, press the upper half of the switch to activate the desired light(s). Press the lower half of the switch to turn the light(s) off.
Exterior light controls are listed here in alphabetical order. See Fig. for exterior light locations. At the rear of the vehicle there are taillights, brake lights with turn signals, backup lights, and optional utility lights.
See Fig. for exterior and interior light switches.
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Fog Light
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Road Light
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Dual Headlights
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Turn Signal/Side-Marker Lights
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Clearance Light
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Identification Lights
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Clearance Light
Fig. 1, Exterior Lights
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Headlights Switch
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Tractor Clearance Lights Switch
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Driving Lights Switch
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Fog Lights Switch
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Backup Lights Switch (sometimes labeled Hook Up Lights)
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Headlight Interrupt Switch
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Trailer Clearance Lights Switch
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Sleeper Lights Switch
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Dash Lights Switch
Fig. 2, Exterior and Interior Light Switches
Backup Lights
Note: Depending on the mounting, backup lights are sometimes referred to as hook-up lights.
Backup lights activate only when the vehicle is in reverse, and are designed to be used while backing up at night.
Clearance Lights
Press the upper half of the clearance lights switch to activate all clearance lamps including back-of-sleeper and mirrors.
Driving Lights
Driving lights are designed to extend the range of the high-beam headlights, and can only be activated when the headlight high-beams are on. When headlights are dimmed, the driving lights automatically turn off.
Fog Lights
Fog lights are designed to reduce glare in foggy conditions. The headlights must be on and set on low beam for the fog lights to activate.
Hazard Warning Lights
The hazard flasher switch is located underneath the turn signal lever, as shown in Fig.. Pull the hazard light switch tab out to activate all of the turn signal lights and both of the telltales on the lightbar will flash. To cancel the hazard lights, move the turn signal lever up or down.
Western Star vehicles may be equipped with an optional hazard light switch located on the right-hand dash panel. To operate the hazard lights, press the upper half of the switch. To cancel the hazard lights, press the lower half of the switch.
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Tilt/Telescopic Steering Column Lever
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Hazard Warning Light Tab
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Turn Signal Lever
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High-Beam Headlight Switch
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Electric Horn
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Trailer Brake Hand Control Valve Lever
Fig. 3, Steering Column-Mounted Controls
Headlight Interrupt
When the headlight interrupt switch is activated, the daytime running lights blink. The headlight interrupt switch only operates when the headlights are on.
Headlights
The headlight switch is operated by pushing the upper half of the switch once for the parking lights, illuminating the taillights and side marker lamps on both the tractor and trailer. Pressing the upper half of the switch a second time activates the headlights. An audible warning will sound if the lights are left on when the ignition is turned off.
High-Beam Headlights
With the low-beam headlights on, push the button on the end of the turn-signal lever to turn on the high-beam headlights. See Fig.. Push the button again to turn the high-beams off.
When the high-beam headlights are on, a blue light illuminates on the lightbar.
Trailer Clearance Lights
The trailer clearance lights switch activates the trailer clearance lamps independent of the tractor lamps.
Turn Signals
The turn-signal switch is typically a non-canceling combination turn-signal, hazard, and headlight-dimmer unit that mounts to a bracket on the left side of the steering column. See Fig..
Moving the turn signal switch down turns on the left-turn signal; moving it up turns on the right-turn signal. To manually cancel the signal, move the lever to the neutral position.
When a turn signal is activated, a green telltale light flashes on the lightbar.
On a self-canceling turn signal switch, the switch automatically returns to the neutral position when the steering wheel returns to the straight ahead position after a turn.