INSTRUMENT PANEL (Con't).
Control or Indicator
Spring-loaded, two-position switch. Switch positions are:
(a) LOCK. Down position prevents movement of main
(b) UNLOCK position. Up position enables movement of
main light switch. Hold lever in UNLOCK position
and move main light switch to desired position.
Four-position switch. Will not function if main light switch
is OFF. Switch positions are:
(a) PANEL BRT. Bright panel lights will function except
if main light switch is in OFF, BO DRIVE, or BO
(b) PANEL DIM. Same as PANEL BRT position, but
panel lights dimmer switch may dim lights.
(c) PANEL OFF. Panel lights will not function.
(d) PARK. When main light switch is in SER DRIVE
position, headlights will be deactivated, leaving all
service marker/tail lights functioning.
Parking Brake Control
Yellow diamond-shaped knob operates parking brake
valve. Pull out to apply and push in to release parking
Trailer Air Supply Control
Red octagonal-shaped knob supplies air to trailer air
reservoirs. Push in to charge trailer air supply and
release trailer spring brakes. Pull out to shut off air
supply and apply trailer spring brakes.
Interaxle Lockout Control
Locks and unlocks driveline based on changing driving
(a) LOCK. In poor traction conditions, stop vehicle and
place lever in LOCK position to lock up driveline.
(b) UNLOCK. When conditions are back to normal,
move left to UNLOCK while vehicle is moving.