Garmin GMI 10 Digital Marine Instrument Display Installation Instructions Manual page 4

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nstallatIon nstructIons
To install the wiring harness:
1. Use a test light or voltmeter to determine the polarity of the voltage source.
2. Connect the red (+ or positive) wire to the positive voltage terminal. (If you use the fuse block on the boat, route the
positive connection through the fuse, as shown on the diagram.)
3. Connect the black (- or ground) wire to the negative voltage terminal.
AGC/3AG – 1 A fuse
4. Install or check the
5. Align the notches on the cable plug and on the back of the GMI 10. Insert the cable into the connector, and turn the
locking ring counter-clockwise until it stops.
Step 4: Connect the GMI 10 to Sensors
The GMI 10 can connect to sensors using either NMEA 2000 or NMEA 0183.
Connecting the GMI 10 through NMEA 2000
The GMI 10 is packaged with the necessary NMEA 2000 connectors and cable
to either connect the GMI 10 to your existing NMEA 2000 network, or build a
basic NMEA 2000 network. For more information on NMEA 2000, visit
www.garmin.com. Follow the directions and reference the diagrams on
to either connect the GMI 10 to your existing NMEA 2000 network, or to build
a basic NMEA 2000 network.
To connect the GMI 10 to your existing NMEA 2000 network:
1. Determine where you would like to connect the GMI 10 to your
existing NMEA 2000 backbone.
2. Disconnect one side of a NMEA 2000 T-connector from the backbone at an appropriate location.
If you need to extend the NMEA 2000 backbone, connect an appropriate NMEA 2000 backbone extension cable (not
included) to the side of the T-connector you disconnected.
3. Add the included T-connector for the GMI 10 in the NMEA 2000 backbone by connecting it to the side of the
T-connector you disconnected.
4. Route the included drop cable to the bottom of the T-connector you just added to your NMEA 2000 network.
If the included drop cable is not long enough, you can use a drop cable up to 20 ft. (6 m) long (not included).
5. Connect the drop cable to the T-connector and the GMI 10.
CAuTION: If you have an existing NMEA 2000 network on your boat, it should already be connected to power. Do not
connect the included NMEA 2000 power cable to an existing NMEA 2000 network, because only one power source should be
connected to a NMEA 2000 network.
To create a basic NMEA 2000 Network
1. Connect the two T-connectors together by their sides.
2. The included NMEA 2000 power cable must be connected to a 12 Vdc power source through a switch. Connect to
the ignition switch of the boat if possible, or through an appropriate additional switch (not included).
3. Connect the NMEA 2000 power cable to one of the T-connectors.
4. Connect the included NMEA 2000 drop cable to the other T-connector and to the GMI 10.
5. Add additional T-connectors for each sensor (not included) you want to add to the NMEA 2000 network, and connect
each sensor to a T-connector with the appropriate drop cable (not included).
6. Connect the appropriate terminators to each end of the combined T-connectors.
CAuTION: You must connect the included NMEA 2000 power cable to the boat's ignition switch, or through an external
switch. The GMI 10 will drain your battery if it is connected directly.

(on the fuse block or in the in-line holder).
page 5
Power/data Power/data
GMI 10 Installation Instructions
NMEA 000 NMEA 000