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Depending on your configuration, you may not use all of these wires.
(For example, many units cannot operate an optional external speaker,
so the white wire on the Power Supply cable isn't functional.) The fol-
lowing segments include instructions for installing all the wires that
you will use with this unit.
Powering a NMEA 2000 Buss
(NMEA 2000 Power cable)
A NMEA 2000 buss must be connected to a 12-volt DC power source to
operate. If you have a pre-existing NMEA 2000 installation, it may al-
ready be connected to another power source. If your NMEA 2000 buss is
already powered, you can ignore the NMEA 2000 Power cable. Never
attach two power sources to a single NMEA 2000 buss.
If you need to power a NMEA 2000 buss, attach the NMEA 2000 Power
cable to an accessory power switch. The cable's red wire should be at-
tached (with the provided 3-amp fuse) to the positive terminal and the
cable's black and shield wires should both be attached to the negative
terminal.
You can attach the NMEA 2000 power cable directly to the boat's bat-
tery, but you must use the fuse and install an on-off switch so
you can shut off power to the network. If a NMEA 2000 power ca-
ble is connected directly to a battery, the NMEA 2000 network will con-
tinuously draw power and drain the battery, even though the boat, your
unit and other NMEA 2000 devices are turned off.
Caution:
Never connect a NMEA 2000 power cable to an un-switched
power supply. Failure to use a power switch will allow the
NMEA 2000 network to drain the boat's battery when the system
is not in use! When you are not using the network, you should al-
ways shut the power off.
Powering the Unit
(Power Supply cable – red and black wires)
The unit works from a 12-volt battery system. For the best results, at-
tach the unit power cable directly to the battery. You can attach the
power cable to an accessory or power buss, but you may have problems
with electrical interference. Therefore, it's safer to go ahead and attach
the power cable directly to the battery.
CAUTION:
When using the unit in a saltwater environment, we strongly rec-
ommend that you shut off the power supply to the unit power cable
when the unit is not in use. When the unit is turned off but still
12
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