Garmin GPSMAP 74 Series Installation Instructions Manual Download Page 3

Item

Wire Color

Wire Function

Red

Power

Black

Ground (power and NMEA 0183)

Blue

NMEA 0183 internal port 1 Tx (Out)

Brown

NMEA 0183 internal port 1 Rx (In)

Gray

NMEA 0183 internal port 2 Tx (Out)

Violet

NMEA 0183 internal port 2 Rx (In)

Orange

Accessory on

Yellow

Alarm low

Connecting the Wiring Harness 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.

1

Route the wiring harness to the power source and to the 

device.

2

Connect the red wire to the positive (+) battery terminal, and 

connect the black wire to the negative (-) battery terminal.

3

If necessary, install the locking ring and O-ring on the end of 

the wiring harness.

4

Insert the cable into the POWER connector on the back of 

the device, pushing firmly.

5

Turn the locking ring clockwise to attach the cable to the 

device.

Additional Grounding Consideration

This consideration is applicable only to devices that have a 

grounding screw. Not all models have a grounding screw.
This device should not need additional chassis grounding in 

most installation situations. If you experience interference, the 

grounding screw on the housing can be used to connect the 

device to the water ground of the boat to help avoid the 

interference.

Garmin Marine Network Considerations

NOTICE

A Garmin Marine Network PoE Isolation Coupler 

(010-10580-10) must be used when connecting any third-party 

device, such as a FLIR

®

 camera, to a Garmin Marine Network. 

Connecting a Power over Ethernet (PoE) device directly to a 

Garmin Marine Network chartplotter damages the Garmin 

chartplotter and may damage the PoE device. Connecting any 

third-party device directly to a Garmin Marine Network 

chartplotter will cause abnormal behavior on the Garmin 

devices, including the devices not properly turning off or the 

software becoming inoperable.

This device can connect to additional Garmin Marine Network 

devices to share data such as radar, sonar, and detailed 

mapping. When connecting Garmin Marine Network devices to 

this device, observe these considerations.
• All devices connected to the Garmin Marine Network must be 

connected to the same ground. If multiple power sources are 

used for Garmin Marine Network devices, you must tie all 

ground connections from all power supplies together using a 

low resistance connection or tie them to a common ground 

bus bar, if available.

• A Garmin Marine Network cable must be used for all Garmin 

Marine Network connections.

◦ Third-party CAT5 cable and RJ45 connectors must not be 

used for Garmin Marine Network connections.

◦ Additional Garmin Marine Network cables and connectors 

are available from your Garmin dealer.

• The NETWORK ports on the device each act as a network 

switch. Any compatible device can be connected to any 

NETWORK port to share data with all devices on the boat 

connected by a Garmin Marine Network cable.

NMEA 2000

®

 Considerations

NOTICE

If you are connecting this device to an existing NMEA 2000 

network, the NMEA 2000 network should already be connected 

to power. Do not connect the NMEA 2000 power cable to an 

existing NMEA 2000 network, because only one power source 

should be connected to a NMEA 2000 network.
If you are connecting this device to an existing NMEA 2000 

network or engine network by another manufacturer, you should 

install a NMEA 2000 Power Isolator (010-11580-00) between 

the existing network and the Garmin devices.
If you are installing a NMEA 2000 power cable, you must 

connect it to the boat ignition switch or through another in-line 

switch. NMEA 2000 devices will drain your battery if the NMEA 

2000 power cable is connected to the battery directly.

This device can connect to a NMEA 2000 network on your boat 

to share data from NMEA 2000 compatible devices such as a 

GPS antenna or a VHF radio. The included NMEA 2000 cables 

and connectors allow you to connect the device to your existing 

NMEA 2000 network. If you do not have an existing NMEA 2000 

network you can create a basic one using cables from Garmin.
If you are unfamiliar with NMEA 2000, you should read the 

“NMEA 2000 Network Fundamentals” chapter of the 

Technical 

Reference for NMEA 2000 Products

. You can find this document 

using the “Manuals” link on the product page for your device at 

www.garmin.com

.

The port labeled NMEA 2000 is used to connect the device to a 

standard NMEA 2000 network.

3

Summary of Contents for GPSMAP 74 Series

Page 1: ...mperature range for this device is listed in the product specifications Extended exposure to temperatures exceeding the specified temperature range in storage or operating conditions may cause device...

Page 2: ...ify placement of the remaining nut plates and holes on the template 13Using a 3 5 mm 1 8 in drill bit drill the smaller holes 14Remove the template from the mounting surface 15Starting in one corner o...

Page 3: ...iled mapping When connecting Garmin Marine Network devices to this device observe these considerations All devices connected to the Garmin Marine Network must be connected to the same ground If multip...

Page 4: ...be connected to a common ground For two way communication with a NMEA 0183 device the internal ports on the NMEA 0183 data cable are not linked For example if the input of the NMEA 0183 device is con...

Page 5: ...etwork on your boat to read data from compatible devices such as certain engines The engine network follows a standard and uses proprietary messages You should connect only one chartplotter to one eng...

Page 6: ...s obsolete 130312 Temperature obsolete Transmit PGN Description 126464 Transmit and receive PGN list group function 127497 Trip parameters Engine Receive PGN Description 065030 Generator average basic...

Page 7: ...lectronic engine controller 2 61444 Electronic engine controller 1 65031 Exhaust temperature 65172 Engine auxiliary coolant 65252 Shutdown 65253 Engine hours and revolutions 65262 Engine temperature 1...

Page 8: ...2016 Garmin Ltd or its subsidiaries support garmin com...

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