Mercury GO BOLDLY SeaPro 500hp Operation And Maintenance Manual page 58

Turning off one of the outer engines while underway will cause the center
engine to go into forced neutral/idle. Operation to the center engine can be
restored by moving the control handle of the functioning outer engine back into
neutral position and then engaging. The center engine speed and gear shift will
then be controlled by the functioning outer engine.
Turning off the center engine while underway will have no effect on the
operation of the outer engines.
If a failure should occur while underway which causes one of the outer engines
into forced neutral/idle condition, the center engine will also be forced to
neutral/idle. Operation to the center engine can be restored by moving the
control handle of the functioning outer engine back into neutral and then
engaging.
QUAD-ENGINE THROTTLE AND SHIFT OPERATION
Movement of the handles on the remote control allows the boat operator to
control the engine throttle speed and gear shift positions of all four engines.
The throttle and shift function is dependent on what engines are running. Refer
to the following table.
Port Outer
Engine
Engine
Running Running
Running Running
Off Off
Off (ignition
key switch
Running
turned ON)
Running Running
FEATURES AND CONTROLS
Port Starboard
Inner Inner
Engine
Running
Off
Running
Running
Running
Starboard
Control Handle Function
Outer Engine
Port inner and outer
engines throttle and shift
= controlled by port
control handle
Running
Starboard inner and
outer engines throttle
and shift = controlled by
starboard control handle
Port inner and outer
engine throttle and shift =
Off
controlled by port control
handle
Starboard inner and
outer engine throttle and
Running
shift = controlled by
starboard control handle
Port inner engine throttle
Running and shift = controlled by
port control handle
Starboard inner engine
Off (ignition
throttle and shift =
key switch
controlled by starboard
turned ON)
control handle
48
eng