Specifications

temperatures. If the system detects readings outside the ac-
ceptable range, the system shuts off the stereo (if ON) and
sounds the alarm for a period of one minute. Even after the
alarm ceases, the Check Engine light will remain on.
This signals the need to return to shore and seek assis-
tance from your dealer as soon as possible to diagnose and, if
necessary, repair the issue.
IGNITION SWITCH
Never leave the ignition switch in the RUN
position without the engine running; this will
prevent the natural discharge of the battery
and result in damage to the starter solenoid.
Note that the STS is equipped with two ig-
nitions, one for each engine and that the en-
gines operate independently of each other.
SAFETY SWITCH
The emergency engine safety switch, called
the lanyard, is an ignition cut-off switch de-
signed to stop the engine in the event of an
operator being thrown from position or mov-
ing too far from the helm.
The lanyard is equipped with a hook on
one end for attachment to your clothing or
PFD, and the opposite end has a slide that
fits over the switch. Be sure that the slide is
firmly attached to the switch before starting.
The switch is located near the throttle control
box. If the slide is left off or loose, the engine
will crank but will not start.
The safety switch lanyard must be attached to the
operator whenever the engine is started. Failure to
do so may result in serious injury or death.
BLOWER SWITCH
A two-position rocker switch activates the engine box ventiliation
blower. Push the top half of the switch to turn the blower ON.
NOTE: The blower must operate for a minimum of four
(4) minutes before starting the engine at any time. The
blower must also be operated during idle and slow-speed
running, but is not necessary at cruising speed.
Failure to operate the blower as instructed could cause improper
ventilation of the boat engine and bilge areas. Fuel vapors can
accumulate in this area and cause a fire or explosion which may
result in serious injury or death!
MANUAL AND AUTOMATIC
BILGE PUMP SWITCH
A three-position rocker switch activates the bilge pump.
Push the top half of the switch to turn the bilge pump to the
manual ON position. Press the switch down to activate the
bilge pump for automatic mode while the boat is underway.
When the switch is centered, the bilge pump is OFF. The bilge
pumps on all V-drive models will be in the auto-
matic mode when the ignition key is turned ON.
BALLAST PUMP SWITCH
On boat models equipped with a ballast sys-
tem, a three-position switch will allow for the
filling or emptying of the ballast tanks and/or
bags. It is important to be aware that the engine
must operate at 1500 RPM during the fill and
empty processes. Failure to do so can result in
malfunction or permanent damage to the ballast
pumps that force the water through the system.
This is not covered under warranty.
CIRCUIT BREAKERS
All major boat circuits are protected from
shorting and overload by re-settable circuit
breakers. If a problem develops with one of
the following circuits, switch OFF the circuit
and wait about one minute. Then push the ap-
propriate breaker button fully and switch ON
the circuit. If the circuit continues to trip, there
is a problem somewhere that must be attended
to immediately. See your MasterCraft dealer.
The location of the main circuit breaker board is under the
dash panel. In some models, there is an additional breaker
panel to assist with the accessory load, and it is located near
the battery box. There may also be a waterproof fuse for the
stereo amplifier, where equipped. If the boat’s accessories are
not functional, check and re-set breakers as necessary.
The engines are also equipped with breaker systems. The
main 50A circuit breaker protects the engine electrical system
and components from overload.
If the engine will not turn over with the battery switch in
the ON position, locate the red breaker re-set button (la-
beled “50”) in the engine.
Firmly push the red button until the breaker re-sets. There
will be an audible click. Try again to start the engine. If the
breaker trips again, the engine requires attention. Take your
boat immediately to your dealer.
In addition to the
50A circuit breaker,
the engines are also
equipped with addi-
tional component
overload protection,
including a 15A ATO
fuse for the fuel pump,
a 15A ATO fuse for
the injectors and a
Never operate the
boat without
the safety
switch, or
lanyard, attached to
your clothing
or PFD.
2005 MASTERCRAFT OWNERS MANUAL–PAGE 6-3