Power Diagram A - Lowrance GlobalMap 4800M Product Support Bulletin

For example, if you have to extend the power cable to the power bus or
battery, attach one end of the fuse holder directly to the power bus or
battery. This will protect both the unit and the power cable in the event
of a short.
This unit has reverse polarity protection. No damage will occur if the
power wires are reversed. However, the unit will not work until the
wires are attached correctly.
To unit
Display Unit
Power Cable
Data Cable
Use this method if you are powering the display unit and a GPS mod-
ule or the display unit and a NMEA 2000 network. (Fuses may be dif-
The network and any NMEA 2000 devices, including the GPS
module, will not operate unless the NMEA 2000 Power Cable is
connected to power. The NMEA 2000 power cable must be connected
to power even if your only NMEA 2000 device is the GPS module and it
is connected to the display unit's Network socket. (However, never
connect multiple power sources to a NMEA 2000 network.
The method in diagram B is also used when your display unit is con-
nected to a NMEA 2000 network that is already connected to power.
(Never connect multiple power sources to a NMEA 2000 network.)

Power Diagram A

NMEA 2000
Power Cable
3-amp fuse
Recommended
display unit
power-off switch
ferent from those shown.)
Mandatory
network
power-off
switch
Shield
Black
White
(unused)
4
3-amp fuse
Black
Red
12 volt DC
power source