Mercury 135 Verado Manual page 71

FEATURES AND CONTROLS
Port Engine
Off
Off (ignition key
switch turned on)
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
re-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 re-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 dependant on what engines are
running. Refer to the following table.
Center Engine
Off Running
Off (ignition key
Running
switch turned on)
63
Starboard Engine
Control Handle
Function
Starboard engine
throttle and shift =
controlled by
starboard control
handle
Center engine
throttle and shift =
neutral/idle unless
both control handles
are in the same gear