Power Diagram B; Powering A Nmea 2000 Network Bus - Lowrance LMS-527cDF iGPS Installation And Operation Instructions Manual

To unit
All unused Data
or NMEA 2000
power wires
should be
capped with
wire nuts and
electrical tape
to prevent
shorts.
Data Cable
Use this method if you are only powering your display unit and are not
powering a NMEA 2000 network or any NMEA 2000 accessory device,
including a GPS module. (Fuse may be different from that shown.)
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.)

Powering a NMEA 2000 Network Bus

A NMEA 2000 bus must be connected to a power source to operate.
NMEA 2000 devices, including GPS modules, draw their power from
the network bus.
If you have a pre-existing NMEA 2000 network installation, it may al-
ready be connected to another power source. If you are not sure about a
network's power status, consult the boat manufacturer or dealer. If your
NMEA 2000 bus is already powered, you can ignore the NMEA 2000
Power cable and use the method shown in Power Diagram B above.
Never attach two power sources to a single NMEA 2000 bus.
If you do need to power your NMEA 2000 bus, attach the NMEA 2000
Power cable to an accessory switch as indicated in power diagram A on
page 32. The NMEA 2000 Power cable's red wire should be attached
(with provided 3-amp fuse) to the positive (+) terminal. The NMEA
2000 Power cable's black and shield wires should both be attached to
the negative (–) terminal.

Power Diagram B

Display Unit
Power Cable
Recommended
power off switch
NMEA 2000 Power Cable
White wire
(unused)
Black wire
33
Red wire with
3-amp fuse
12 volt DC
power source