Wiring And Interfacing - Garmin Fishfinder 320C Owner's Manual And Reference Manual

Garmin car gps receiver owner's manual 320c

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Template manual (1 page)

Specifications (2 pages)

Specifications (2 pages)

Table Of Contents

Table of Contents

Connecting the Power/Data Cable

The power/data cable connects the Fishﬁ nder 320C to a 10-35 volt DC system and provides interface

capabilities for connecting external devices. The color code in the diagram (pg. 4) indicates the appropriate

harness 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 on

your current fuse block. If you are using the boat' s fuse block, remove the in-line fuse holder supplied with

the unit. If your boat does not have a fuse block, the unit can be wired directly to the battery. Make sure the

2-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 Fishﬁ nder 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 Fishﬁ nder

320C can send depth, temperature, and speed information. It can also mark a location (pg. 13) that could

be 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 Fishﬁ nder 320C

with 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) wires

from both devices must be attached together or on the same fuse terminal for data ground. Refer to the

wiring diagram of your GPS unit for wire identiﬁ cation.

2. Connect the Blue (Data Out) wire from the Fishﬁ nder to the Data IN wire on the GPS harness.

3. Connect the Brown (Data In) wire from the Fishﬁ nder to the Data OUT wire on the GPS harness.

4. Set the Fishﬁ nder 320C NMEA Input/Output to 'On' (pg. 18). For Garmin GPS units, set the

communications interface to NMEA/NMEA, NMEA In/NMEA Out or NMEA.

Installation