© 5/2013 Ilmor Marine, LLC, Version 1.0 2-5
INTRODUCING THE MV8
ELECTRICAL SYSTEM
e 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 o a breaker
appears to remove power from the circuit because it turns o whatever is
connected to that circuit. But with reversed polarity you have disconnected
from ground, not from power. e circuit is live.
WARNING! Always connect the positive (+) battery cable rst. e
battery positive cable (+) connects at the starter motor battery post.
e 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. Aer the connection is made, all other positive
engine circuits will be connected to the battery positive from this junction.
e supplied heavy rubber boot (red) must be used on the starter motor
terminal to shield the terminal and prevent accidental contact.
WARNING! Always disconnect the negative battery cable (-) rst before
disconnecting the positive battery cable (+). e battery negative (−), or
ground, connects to the stud at the engine bell-housing.
Fuse Box
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. e fuse box is
mounted on the rear of each MV8 engine.
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