ComNav Marine 1420 Autopilot System
Power Connection
There is 7.5 feet (2.3 m) of power cable
included with your Autopilot System. We
recommend that you do not lengthen this
cable.
However, if you must extend the cable:
• Use the shortest extension length
possible; it must be less than 10 feet
(3 m) in length.
• Use no less than #10 or 12 AWG
conductors. Splice and solder the
joints.
• Make the joints watertight by using
heat-shrink tubing and silicon, or
some other watertight covering.
Power Cable
The Power Cable is labelled with a "5".
Connect the Power Cable to a breaker
capable of supplying at least 20 Amperes
at 12 Volts DC.
The white wire is for Battery Positive from
the breaker. The black wire is Battery
Negative. The green wire must be wired
to the ground point (see Grounding,
next).
Route Cable #5 to the Processor location.
Keep the breaker turned off until you
have connected the wires to the breaker.
Grounding
The Power Cable also contains a
grounding wire. Connecting this wire to a
good ground (see * below) may reduce
static on radios and improve GPS
reception.
Many different grounding methods can be
used:
1. If you have a small vessel, the
negative battery post can be used.
• If you have several electronic
instruments, each must be
attached to the battery individually.
Do not connect one instrument to
another and then to the battery
post.
2. If you have a ground plane for a radio
on your boat, connect the ground wire
to that ground plane.
* A proper ground connection point must
be at the same voltage level as battery
negative. Any difference in voltage
between battery negative & the ground
point may indicate a problem in the
wiring, and so the ground-point wiring
must be re-done, or replaced. Ensure
that all ground connection wires are as
short as possible, and that all connectors
are clean.
Document PN 29010012 V1.3
14
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