Garmin GSD 20 Installation Manual page 6

Installation
Wiring
GARMIN
GPSMAP UNIT
POWER IN
ALARM
GROUND
DATA OUT
DATA IN
4
BASIC WIRING FOR GARMIN GSD 20 TO SINGLE
GPSMAP 182/182C/232
WIRE
COLOR
1.5 A
18 AWG
RED
SWITCH - SEE NOTE 5
+
ALARM
SEE NOTE 2
YELLOW
-
BLACK
18 AWG
BLUE
BROWN
NOTES:
1. ALL WIRES 24 AWG OR LARGER UNLESS OTHERWISE NOTED. FOR RUNS OVER
30' (9.1 m), USE 4-CONDUCTOR, SHIELDED 24 AWG WIRING.
2. THE ALARM OUTPUT CAN BE USED TO DRIVE A LAMP, HORN, OR BOTH.
MAXIMUM CURRENT IS 100 MILLIAMPS. A SWITCH OR RELAY CAN BE USED
TO SELECT BETWEEN VISUAL AND AUDIBLE ALERTS, IF REQUIRED.
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.
4. IN ORDER TO UPDATE THE GSD 20 SOFTWARE, THE GPSMAP UNIT MUST BE
CONNECTED TO PORT A OF THE GSD 20.
5. THE ORANGE WIRE MUST BE PULLED LOW (-) IN ORDER FOR THE GSD 20 TO
POWER ON. IF THE GSD 20 IS BEING WIRED TO A CIRCUIT THAT IS ALREADY
SWITCHED ON THE POSITIVE (+) WIRE, CONNECT THE ORANGE AND BLACK
WIRES TO THE SAME GROUND AND DO NOT INSTALL A SWITCH. THE GSD 20
WILL TURN ON/OFF WHEN POWER IS APPLIED/REMOVED TO THE RED (+) WIRE.
TWO SWITCH LOCATIONS ARE SHOWN, BUT ONLY ONE SWITCH IS NEEDED.
BARE DRAIN WIRE - N/C DO NOT TERMINATE
SEE NOTE 3
2 A
OR
SWITCH - SEE NOTE 5
Closed - ON
SHIP'S BATTERY
Open - OFF
10-35 VOLTS
GARMIN GSD 20
WIRE
SOUNDER MODULE
COLOR
BARE SHIELD DRAIN
RED POWER IN
ORANGE ON (REMOTE POWER)
BLACK GROUND
WHITE/BLUE
WHITE/BROWN PORT A OUT
WHITE/RED
PORT B IN
WHITE/BLACK PORT B OUT