Correct installation is critical to the
performance of the FISH 4432/4433. There are
two components to install, the display unit and
6 Installation and Maintenance
the transducer. It is vital to read the entire
installation section of this manual before
attempting to install the components.
1 Amp fuses must be positioned where
shown in the wiring diagrams.
The power/data cable contains 5 wires:
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
Green* External beeper or light out,
switched to ground, 30 V DC 200
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 this section:
• Basic wiring. This does not start the fishfinder
automatically when the boat ignition is switched on
and it disables the engine hours counter.
• Auto power wiring. This must be used for the
engine hours and fuel computer options.
• 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 instruments,
describes NMEA and NavBus.
12 V DC
This requires the FISH 4432 and FISH 4433 to be
powered on manually with the key.
Black wire: Connect this to the negative
Red wire: Connect this to the positive battery
terminal after the main switch. Fit a 1 Amp fuse
Yellow wire: Connect this to the black wire.
This disables the engine hours counter.
Power on the fishfinder manually whenever the
main switch is on.
White Wire: Use this, if desired, to connect the fishfinder to other NMEA instruments such as
Navman’s REPEAT 3100. (See section 6-5 Systems of several instruments.)
NMEA wiring Option (FISH 4433 only)
FISH 4432/4433 Installation and Operation Manual29 NAVMAN