Master Switch
Page 25
MASTER SWITCH
The Master Switch controls the
electrical system and lights under
the selected ENGINE STOP, DAY
RUN, NIGHT RUN, or PARK
positions.
Engine Stop Position
The following essential circuits are
energized.
•
Fire suppression
•
All other circuits are
de-energized.
Day Run Position
All electrical control circuits are
energized, except for:
•
Exterior lighting.
Night Run Position
Used for night and inclement
weather operation. All electrical
control circuits are energized,
including the running lights and
headlights.
When the interior light switch is
placed in the NORMAL position,
running lights and headlights
illuminate as the Master Switch is
placed in the NIGHT RUN position.
The heater, defroster, and air
conditioning blower motors only
operate when the Master Switch is
placed in the DAY RUN or NIGHT
RUN position with the engine
running, and with the desired side
control panel switch selected.
Park Position
All electrical control circuits are
de-energized, except for the
clearance and tail lights.
When the Master Switch is placed in
the PARK position, the engine shuts
down.
