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Garmin GHP 12 Autopilot System Manual

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8 GHP12InstallationInstructions

After you have planned the GHP 12 installation on your boat and
satised all of the mounting and wiring considerations for your
particular installation, you can begin mounting and connecting the
components.

The drive unit drives the rudder and is sold separately from the GHP 12.
When you purchase a drive unit from Garmin, it will have the correct
cables and connectors.
If you a drive unit is installed on your boat already, you can purchase
GHP 12 drive unit cables (not included) to adapt your drive unit for use
with the GHP 12.

Use the installation instructions provided with the drive unit to
install it on your boat.

In order to use a non-garmin drive unit with the GHP 12, you must
install both the GHP 12 drive unit power cable and the GHP 12 rudder
feedback cable. Both cables are sold separately.
1. If your drive unit has cables connected, disconnect the cables.
2. Consult the documentation provided by the manufacturer of your
drive unit to identify the connections on your drive unit.
3. Connect the GHP 12 drive unit power cable (not included) to your
drive unit, based on the wire colors and functions dened below.
 
Red Drive unit positive
Black Drive unit negative
Blue Clutch power (cut and tape this wire if your drive unit
has no clutch)
White Clutch ground (cut and tape this wire if your drive
unit has no clutch)
The GHP 12 drive unit power cable cannot be extended.
4. Connect the GHP 12 rudder feedback cable (not included) to your
drive unit, based on the wire colors and functions dened below.
 
Red Feedback positive (+)
Black Feedback negative (-)
Yellow Feedback wiper
If necessary, extend the appropriate wire with 22 AWG (.33 mm
2
)
wire.
5. If necessary, use the installation instructions provided with the drive
unit to install it on your boat.

The GHP 12 drive unit power cable is shipped with a 40 A, blade-type
fuse. The included fuse must not be used if it is not the appropriate fuse
for your drive unit.
1. Consult the manufacturer of your drive unit to determine the correct
fuse type.
2. Select an option:
• If the 40 A fuse is appropriate, install it in the fuse holder.
• If your drive unit requires a different fuse, install the correct fuse
for your drive unit.

To install the ECU, you must mount it to your boat, connect it to the
drive unit, and prepare the battery wiring.

Before you can install the ECU, you must select a mounting location
and determine the correct mounting hardware (page 5).
1. Cut out the mounting template provided on page 25.
2. Tape the template to the mounting location.
3. Drill pilot holes at the four mounting locations.
4. Use screws to mount the ECU.

Connect the two cables from the drive unit to the connectors marked
DRIVE and FEEDBACK on the ECU.
The connectors are keyed and color coded to the appropriate ttings
on the wires.

Notice
Do not remove the in-line fuse holder from the battery cable when
connecting to the battery. If you remove the in-line fuse holder, you will
void the GHP 12 warranty and possibly damage the GHP 12 autopilot
system.
You should connect the ECU power cable directly to the boat battery
if possible. Although it is not recommended, if you connect the power
cable to a terminal block or other source, connect it through a 40 A fuse.
If you plan to route the ECU through a breaker or a switch near the
helm, consider using an appropriately sized relay and control wire
instead of extending the ECU power cable.
1. Route the connector-terminated end of the ECU power cable to the
ECU, but do not connect it to the ECU.
2. Route the bare-wire end of the ECU power cable to the boat battery.
If the wire is not long enough, it can be extended. Consult the table
to determine the correct wire gauge for an extended run.
 
10 ft. (3 m) 12 AWG (3.31 mm
2
)
15 ft. (4.5 m) 10 AWG (5.26 mm
2
)
20 ft. (6 m) 10 AWG (5.26 mm
2
)
25 ft. (7.5 m) 8 AWG (8.36 mm
2
)
3. Connect the black wire (-) to the negative (-) terminal of the battery.
4. Connect the red wire (+) to the positive (+) terminal of the battery.
5. Do not connect the ECU power cable to the ECU.
Connect the power cable to the ECU only after you install all of
the other GHP 12 components.
… 8 …


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