Garmin GPSMAP 278 - Manual (Page 112)

Installation Information
This section of the Appendix provides information on connecting the
GPSMAP 278 to auxiliary devices and removing the antenna.
Connecting the Power/Data Cable
The power/data cable connects the GPSMAP 278 to an 11–35 VDC
system and provides interface capabilities for connecting external
devices. The color code in the diagram below and to the right
indicates the appropriate harness connections. Replacement fuse is a
3AG - 1.5 Amp fuse.
Power/Data Connector on the GPSMAP 278 Unit
Data Out 1
Blue
Ground
Black
Voice (-)
Orange
Alarm
White
Power
Red
Voice (+)
Brown
Data In 1
Yellow
Data In 2
Green
Data Out 2
Violet
Power/Data Connector on the Cable
Data Out 1
Blue
Ground
Black
Voice (-)
Orange
Alarm
White
Power
Red
Voice (+)
Brown
Data In 1
Yellow
Data In 2
Green
Data Out 2
Violet
Yellow:
Data In 1
Black:
Ground
Red: Power
11–35 VDC
(-) (+)
Autopilot/
NMEA Device
RXD +
RXD -
GSD 20 or 21
Sounder (-)
(+)
White/Brown
White/Blue
Blue:
Data Out 1
Orange
Closed - On,
Open - Off
Switch
0 GPSMAP 278 Owner’s Manual
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