Garmin GSD 21 Installation Instructions - Page 10

INSTALLATION INSTRUCTIONS 8 Serial Wiring for the Garmin GSD 21 to a Single GPSMAP 172/172C FUSE 2A WIRE COLOR RED BLACK BLUE BROWN ORANGE WIRE COLOR RED FUSE 2A BLACK WHITE/BLUE WHITE/BROWN ORANGE GARMIN GSD 21 SOUNDER MODULE TO TRANSDUCER BATTERY 10-35 VOLTS DC Notes: 1. You can extend the serial/power wiring of the GSD 21 power/data cable up to 100 ft (30 m) total length. Use the CANet Extension Cable or 22 AWG, 4-conductor shielded cable for data connections and 18 AWG for power. 2. Ground the drain wire at the display unit. Do not ground the drain wire on the sonar unit. 3. Refer to the GPSMAP 172/172C Owner's Manual for wiring the GPS 17 sensor and other devices. 4. When crimping the 3-wire connector, use a standard pair of pliers and make sure the button is fully depressed into the connector. GSD 21 Sonar Module