4
Torque the hex bolts to 0.81 kgf-m (70 lfb-in. [6 lbf-ft.]) to
fasten the antenna to the pedestal without damaging the
antenna or the mounting hardware.
Wiring and Connection Considerations
It may be necessary to drill 32 mm (1
1
/
4
) in. holes for routing the
power, network, or grounding cables.
• When routing multiple cables through the same hole, you
must route the network cable before the power and ground
cables because of the size of the network connector.
• You must apply marine sealant to the hole after the cables
are in place to ensure a waterproof seal.
If you must make the routing hole in a visible location,
decorative cable grommets can be purchased from Garmin or a
Garmin dealer (optional).
• If needed, you can trim the grommet to enable you to route
multiple cables through the same hole.
• The optional grommet does NOT provide a waterproof seal.
You must apply marine sealant to the grommet after the
cables are in place to ensure a waterproof seal.
When installing the cables, you should observe these
considerations.
• Cutting the Garmin Marine Network cable is not
recommended, but a field install kit can be purchased from
Garmin or a Garmin dealer if you must cut the network cable.
• The ground cable is not included, and must connect to a
water ground location, not the negative terminal of the battery
(
).
• To ensure safety, appropriate tie-wraps, fasteners, and
sealant should be used to secure the cable along the route
and through any bulkheads or the deck.
• You should not run cables near moving objects and high-heat
sources, or through doorways and bilges.
• To avoid interference with other equipment, you should not
run network and power cables parallel to other cables, such
as radio antenna lines or power cables. If this is not possible,
the cables should be shielded with metal conduit or a form of
EMI shielding.
• You should install the power cable as close to the battery
source as possible.
◦ If it is necessary to extend the power cable, you must use
the appropriate wire gauge (
).
◦ Incorrectly extended runs of cable may cause the radar to
malfunction due to insufficient power transmission.
Connecting to Power Through the Voltage Converter
WARNING
When connecting the power cable, do not remove the in-line
fuse holder. To prevent the possibility of injury or product
damage caused by fire or overheating, the appropriate fuse
must be in place as indicated in the product specifications. In
addition, connecting the power cable without the appropriate
fuse in place voids the product warranty.
NOTICE
Do not reuse any voltage converters from previous Garmin radar
models, or third party voltage converters. Using any converter
other than one included with the radar may damage the radar or
prevent it from turning on.
Some radar models require a voltage converter unit to properly
power the device. If your model is packaged with a voltage
converter, it must be installed in order for your radar to function.
If your model is not packaged with a voltage converter, connect
the power cable directly to the boat battery (
).
When installing the voltage converter for an applicable radar
model, observe these considerations.
• The voltage converter requires an input voltage of 10 to
32 Vdc.
• It is recommended to install the voltage converter as close as
possible to the power source.
• Connecting the power cable for the voltage converter directly
to the battery is recommended. If it is necessary to extend
the cable, the appropriate gauge of wire must be used for the
length of the extension (
).
Item
Description
À
To the Garmin Marine Network
Á
10 A fuse holder
Â
Red (+)
Ã
Black (-)
Ä
To the boat battery (10 to 32 Vdc)
Å
30 A fuse holder
Water ground connection
1
Route the power cable to the radar and the voltage converter.
2
Use crimp connectors and heat-shrink tubing to connect the
power cable to the voltage converter.
The radar power cable contains a 10 A fuse which should not
be removed when connecting to the voltage converter.
3
Connect the voltage converter to the boat battery through the
included 30 A fuse.
The 30 A fuse between the voltage converter and battery is in
addition to the 10 A fuse included in the radar power cable.
Both fuses must be in place for the radar to function properly.
4
Connect the power cable to the POWER port on the radar.
Connecting Directly to Power
WARNING
When connecting the power cable, do not remove the in-line
fuse holder. To prevent the possibility of injury or product
damage caused by fire or overheating, the appropriate fuse
must be in place as indicated in the product specifications. In
addition, connecting the power cable without the appropriate
fuse in place voids the product warranty.
Some radar models do not require a voltage converter unit. If
your model is packaged without a voltage converter, it should be
connected directly to power.
3
Summary of Contents for GMR 420 XHD2 Series
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