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6 Wiring installation
6.1 Electrical system and system specifications
Proper installation of the engine to the electric system of the
boat is the responsibility of the installer. Carefully read the
instructions in this chapter.
In principle, it is appropriate to make sure that all the metallic
components inside the boat have their frame connected to the
ground continuity.
Check that each electrical connection is made in a solid way
and isolated from the outside.
6.2 Battery and power supply
Each engine installed on the boat needs a separate battery. In
the case of twin installations (two engines), make sure you
have a battery for each engine.
The specifications of the batteries are as follows:
Characteristics
Typology
Rated Voltage [V]
Capacity [Ah]
Minimum pick-up current [A]
Connectors
Do not use batteries with threaded, nut ,or wings
connector.
To comply with the needs of correct operation of the engines it
is necessary to use an auxiliary battery prepared exclusively
for such services and dimensioned in accordance with the
number and the maximum load of the devices.
Do not use the battery engine to connect services.
The current absorption can cause malfunction of the
engine.
6.2.1 Cables diameter and length
it is necessary to place the battery as close as possible to the
engine to use short battery cables.
The diameter of the battery cables must be selected according
to their length. Follow the table below:
30 – FNM® Series HPE – Installation Manual
Value
Suitable for marine use,
excellent resistance to load
and unload cycles
12
>110
>850
Conical Clamps
Cable length [m]
up to 0.9
from 0.9 to 1.4
from 1.4 to 1.8
from 1.8 to 2.4
from 2.4 to 3.1
from 3.1 to 3.6
from 3.6 to 4.8
from 4.8 to 6.1
* use two cables for each pole
It is recommended to tin solder the wires to the
battery to ensure the durability of the electrical
contact.
Battery wear reduces the starting current, it is
necessary to strictly comply with specifications to
avoid starting problems and engine operation.
6.2.2 Connection to the battery
The power cables from the battery must be connected as
described below, as applicable:
Failure to comply with the instructions for connecting
the battery can lead to failure of electric parts of the
engine. Always follow the instructions provided.
1. Single-engine installation, single battery: connect the
battery terminals to the engine:
o Positive (marked with +): to the pole B+ of the starter
engine of the engine (see paragraph3.3 – Engine
elements on page 8).
o Negative (marked with -): to the ground point on the
engine wiring (see paragraph 3.3 – Engine elements
on page 8). Be sure to remove the paint to ensure
adequate electrical contact between the cable and
the engine.
Engine battery
Figure 33 - Wiring diagram for single-engine, single battery
2. Single engine, two batteries installation with load
dispatcher, see diagram below:
Class
Minimum thickness [mm
2
35
0
50
00
70
000
95
0000
120
2* x 00
2 x 70
2* x 000
2 x 95
2* x 0000
2 x 120
Alternator
Ground point on the crankcase
installation.
]
2
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