Garmin Fishfinder 320C Owner's Manual And Reference Manual

Also see for Fishfinder 320C: Template manual Specifications Specifications

3To 10-35 Volt Boat Supply2A-+Boat GroundBlack WireRed WireInstall 2-AmpFuseTo Fishfi nder 320CInstallationConnecting the Power/Data CableThe power/data cable connects the Fishfinder 320C to a 10-35 volt DC system and provides interfacecapabilities for connecting external devices. The color code in the diagram (pg. 4) indicates the appropriateharness connections. Replacement fuse is a AGC/3AG - 2 Amp fuse. If it is necessary to extend the power/data wires, use a wire of comparable size and keep your extension as short as possible.If your boat has an electrical system, it may be possible to wire the unit directly to an unused holder onyour current fuse block. If you are using the boat’s fuse block, remove the in-line fuse holder supplied withthe unit. If your boat does not have a fuse block, the unit can be wired directly to the battery. Make sure the2-Amp in-line fuse supplied with the unit is installed if connecting the unit direct to the battery.Installing the Wiring Harness (Basic):1. Determine the polarity of the fuse holder using a Test Light or Volt Meter.2. Install the Red (+) wire on the Positive Fuse Holder Terminal.3. Install the Black (-) wire on the Negative Fuse Holder Terminal.4. Install a 2 amp fuse in the Fuse Holder.The Fishfinder 320C can be connected to another piece of NMEA compatible electronic equipment,such as a Garmin GPS (Global Positioning System). If equipped with a capable transducer, the Fishfinder320C can send depth, temperature, and speed information. It can also mark a location (pg. 13) that couldbe displayed on another device and can accept GPS navigational data (pg. 14), such as position, time,course, distance, etc. Refer to the wiring diagram on the following page for interfacing the Fishfinder 320Cwith other devices.Installing the Wiring Harness to a GPS:1. Follow steps 1-4 of the above wiring harness installation. For Garmin units, the Ground (black) wiresfrom both devices must be attached together or on the same fuse terminal for data ground. Refer to thewiring diagram of your GPS unit for wire identification.2. Connect the Blue (Data Out) wire from the Fishfinder to the Data IN wire on the GPS harness.3. Connect the Brown (Data In) wire from the Fishfinder to the Data OUT wire on the GPS harness.4. Set the Fishfinder 320C NMEA Input/Output to ‘On’ (pg. 18). For Garmin GPS units, set thecommunications interface to NMEA/NMEA, NMEA In/NMEA Out or NMEA.Wiring and Interfacing