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7GSD 20 Sonar Module
INSTALLATION INSTRUCTIONS
WIRE
COLOR
GARMIN GSD 20
SOUNDER MODULE
BLACK
ORANGEORANGE
RED
WHITE/BLUE
BLACK
RED
BLUE
BROWN
WHITE/BROWN
WIRE
COLOR
FUSE
5A
FUSE
2A
TO
TRANSDUCER
BATTERY
10-35 VOLTS DC
BASIC WIRING FOR THE GARMIN GSD 20 TO A SINGLE GPSMAP 172/172C
Notes:
1. Power and ground wires require 18 AWG. All other wires require 22 AWG. Use 4-conductor, shielded wiring for runs over 30’ (9.1 m).
2. Refer to the GPSMAP 172/172C Owner’s Manual for wiring the GPS 17 sensor and other devices.
3. For runs over 30’ (9.1 m), the drain wire must be connected to the shielding of the extension run. Do not terminate the end of the shield drain wire.