Correct installation is critical to th e
performance of the FISH 4432/4433. Ther e are
two components to install, the displ ay unit and
6 Installation and Maintenance
the transducer. It is vital to read the entire
installation section of this manu al before
attempting to install the components.

Warning

1 Amp fuses must be positioned w here
shown in the wiring diagrams.
The power/data cable contains 5 wires :
Wire Function
Black Ground (power negative)
White* NMEA out
Red Positive power in, 12 V DC
Yellow Auto power in (connect to red
wire. Positive power in, to enable
Auto power).
Green* External beeper or light out,
switched to ground, 30 V DC 200
mA maximum.
Note: The cable shield is connected to Pin 1 (black
wire) and does not need to be grounded.
* Denotes FISH 4433 only.
Six wiring options are described in t his section:
• Basic wiring. This does not st art the fi shfinde r
automatically when the bo at ignitio n is switche d on
and it disables the engine h ours coun ter.
• Auto power wiring. This must be u sed for the
engine hours and fuel com puter optio ns.
• Secondary Alarm wiring
• NMEA wiring
• Single engine fuel wiring
• Twin engine fuel wiring
Note: If a wire colour is not specifically
mentioned, it is not used in that wiring option.
Section 6-5 Systems of several instr uments,
describes NMEA and NavBus.
Wiring Options
Fuse Red
Yellow
Black
Main
switch
12 V DC

Basic wiring

This requires the FISH 4432 and FISH 4433 to be
powered on manually with the key.
Black wire: Connect this to the negative
battery terminal.
Red wire: Connect this to the positive batter y
terminal after the main switch. Fit a 1 Amp fuse
as shown.
Yellow wi re: Co nnect this to the black w ire.
This disables the engine hours counter.

Basic wiring

Power on the fishfinder manually w henever the
main switch is on.
White Wire: Use this, if desired, to connect the fis hfinder to other NME A instruments such as
Navman’s REPEAT 3100. (See section 6-5 Systems of several i nstruments.)

NMEA wiring Option (FISH 4433 only)

FISH 4432/4433 Installation and Operation Manual29 NAVMAN