Garmin 190-01166-02 User Manual

2.  Connect the black wire (-) to the negative (-) side of the battery first.
3.  Connect the red wire (+) to the positive (+) side of the battery next.
4.  Connect the ECU power cable to the ECU last.
  To connect the data cable to the GHC 10, align the notches on the cable plug and on the back of the GHC 10. Insert the cable into 

the connector, and turn the locking ring clockwise until it stops.

  notE: After the ECU and the GHC 10 are connected to power, the GHP 10 autopilot system and the NMEA 2000 network can be 

powered on.

Air must be purged completely from all the hydraulic lines, the helms, the cylinders, the pump, and the Shadow Drive for the system 

to function. If the hydraulic system is not bled, then the GHP 10 autopilot system will not work correctly. Follow the instructions 

provided by the manufacturer of your steering system to properly bleed the hydraulic system on your boat. Treat the pump as 

the lowest helm when bleeding the system.

Disable the Shadow Drive from the GHC 10 to make the bleeding process easier. On the GHC 10, select 

 > 

 > 

 > 

 > 

. Change the 

 setting to 

. 

Remember to enable the Shadow Drive after the bleeding process is complete.
To completely bleed the hydraulic system, it may be necessary to drive the autopilot pump in both directions to remove any air 

trapped within the pump. You can do this during the Verify Steering Direction portion of the Dockside Wizard (see 

Drive the rudder to each stop in each direction, and then perform any additional bleeding that may be necessary.

Check for leaks at every hydraulic fitting, both after the bleeding process is complete and after the sea trial is complete.

The compact 2.1 L pump has a bypass valve to aid in the hydraulic-system bleeding process. In addition to the general instructions in 

the following section, follow the standard bleeding recommendations provided by the manufacturer of your helm.
note: Neither the 1.2/2.0 L pump nor the legacy 2.1 L pump has this bypass valve. These steps only apply to the compact 2.1 L 

pump.

1.  Ensure the helm reservoir is full of hydraulic fluid. Add fluid if necessary.
2.  Manually steer the helm to both cylinder stops.
3.  Manually steer the helm fully to port to the stop.
4.  Open a bypass valve at the cylinder ports.
5.  Turn the helm slowly to port for 3 minutes.
6.  Close the cylinder bypass valve.
7.  Check the helm reservoir level, and add fluid if necessary. Continue to perform steps 2 through 7 until the helm reservoir level 

remains full.

8.  Open the bypass valve on the manifold of the compact 2.1 L pump.
9.  Push and hold the 

 soft key on the GHC 10 for 10 seconds, and watch for steering movement. If there is no movement, 

push the 

 soft key.

10. Continue to hold the soft key that produces steering movement and steer fully to the stop.
11. Steer the helm to both cylinder stops using the GHC 10.
12. Close the bypass valve on the manifold of the compact 2.1 L pump.

Ensure that the built-in bypass valve on the pump manifold is fully closed during normal operation to avoid possible autopilot 

performance degradation.

13. Check the helm reservoir level, and add fluid if necessary. Perform steps 2 through 7 until the helm reservoir level remains full.

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