2011 ILMOR MV8 Owner’s Manual • Page 8
ELECTRICAL
SYSTEM
The electrical system
on the MV8 is a 12-volt negative ground system. As
a result, it is important to keep in mind that operators must avoid reverse polarity, which
could lead to extensive damage of the electronics. Any damage occurring as a result of
reverse polarity will not be covered by warranty.
Reversed polarity also presents a serious shock risk. Turning off a breaker appears to
remove power from the circuit because it turns off whatever is connected to that circuit.
But with reversed polarity you have disconnected from ground, not from power. The
circuit is live!
When connecting the battery cable, always connect the positive (+) battery cable
first. After the positive cable is connected, then the negative (-) battery cable can be
attached. This minimizes the possibility of electrical contact. Always disconnect the
negative battery cable first before disconnecting the positive battery cable.
The battery positive cable (+) connects
at the starter motor battery post.
The battery negative (-), or ground,
connects to the stud at the engine bell-
housing.
The positive post of the battery is connected to
the large post provided on the starter motor with
marine grade single ought (1/0) starter wire and
appropriate eyelet. After the connection is made, all
other positive engine circuits will be connected to
the battery positive from this junction. The supplied
heavy rubber boot (red) must be used on the starter
motor terminal to shield the terminal and prevent
accidental contact.
In addition to circuit breakers
in the boat that may impact the engine
functionality or ancillary equipment and electronics that borrow power from the engine,
the engine is also equipped with a fuse box that adds control over various electronic func-
tions of the engine. The fuse box is mounted on the rear of each MV8 engine.
Fuse Box