Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...

Ignition Switch
Dash-Mounted Features
Keys and Locks
The same key operates the ignition and opens the doors.
Frame-mounted tool box locks and locking fuel tank caps
each have individual keys.
Ignition Switch
Your ignition switch has four positions:
• OFF: In this (center) position, all accessories are off
(except those listed below), and you can remove the
key:
– Brake lights
– Panel lights
– Tail lights
– Cigarette lighter
– Clearance lamps
– Horn
– Headlights
– Radio station memory
– Emergency hazard flasher
– Auxiliary power
– Dome light
PART 4: CONTROLS AND DISPLAYS
This is the key position that will stop the engine from the
left-hand drive station.
• ACC (Accessory): In this position (to the left of center),
you can play the radio or use other accessories, but
your engine won’t start.
• ON: In this position (to the right of center), all circuits
except the cranking circuit are energized. The warning
light bar and the multiplex instrument system will
begin its start-up (self-test) procedure. In this switch
position, the key cannot be removed.
• START: When the key is turned and held in this position
(full right of center), the starter motor will engage
and crank the engine. Also, it is not uncommon for
some or all of the multiplex instrument system gauges
to begin their start-up procedure again. This is due to
the drop in the system voltage during engine cranking.
NOTE: The multiplex instrument system start-up
(self-test) procedure is described in "PART 7:
STARTING & OPERATING THE VEHICLE" of this
manual.
– 24 – Y53-6015 R(08/07)