Garmin GPSMAP 190-00683-00 - Manual (Page 125)

Installation Information
This section of the Appendix provides information on connecting the
GPSMAP 378/478 to auxiliary devices and removing the antenna.
Connecting the Power/Data Cable
The power/data cable connects the GPSMAP 378/478 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 378/478 Unit
Data Out
Blue
Ground
Black
Voce (-)
Orange
Alarm
Whte
Power
Red
Voce (+)
Brown
Data In
Yellow
Power/Data Connector on the Cable
Data Out
Blue
Ground
Black
Voce (-)
Orange
Alarm
Whte
Power
Red
Voce (+)
Brown
Data In
Yellow
Yellow:
Data In
Black:
Ground
Red: Power
11–35 VDC
(-) (+)
Autopilot/
NMEA Device
RXD +
RXD -
GSD 21
Sounder (-)
(+)
White/Brown
White/Blue
Blue:
Data Out
Orange
Closed - On,
Open - Off
Switch
GPSMAP 378/478 Owner’s Manual 117
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