Installation Information - Garmin GPSMAP 378 Owner's Manual

A > I I
PPENDIX NSTALLATION NFORMATION

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.
Ground
Black
Alarm
White
Voice (+)
Brown
Data In
Yellow
Power/Data Connector on the GPSMAP 378/478 Unit
118
Voice (-)
Data Out
Orange
Blue
Power
Red
Data Out Voice (-)
Blue Orange
Power
Red
Power/Data Connector on the Cable
Red: Power
Black:
Ground
Blue:
Data Out
Switch
Closed - On,
Open - Off
Yellow:
Data In
GPSMAP 378/478 Owner's Manual
Ground
Black
Alarm
White
Voice (+)
Brown
Data In
Yellow
(-) (+)
11–35 VDC
RXD +
Autopilot/
NMEA Device
RXD -
(+)
White/Blue
Orange
GSD 20 or 21
Sounder
(-)
White/Brown