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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,
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
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 do not need to connect the
NMEA 2000 Power cable. You can connect the LGC-3000 directly to the
display unit or anywhere along the network and it will operate. 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 7. 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
To display unit
Recommended
power off switch
NMEA 2000 Power Cable
including a GPS module.
Display Unit
Power Cable
Black wire
8
Red wire with
3-amp fuse
12 volt DC
power source
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