Step 4: Install The Wiring Harness - Garmin 400C Owner's Manual

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Step 4: Install the Wiring Harness

The Fishfinder 400C comes with a wiring harness that connects
the fishfinder to power and the transducer with one easy-to-remove
connection and provides interface capabilities for connecting
external devices.
The color code in the diagram (see
harness connections. The replacement fuse is a AGC/ 3AG - 3 Amp
fuse. If it is necessary to extend the power wires, use 22 AWG wire.
DO NOT cut the transducer cable, because this voids your warranty.
If your boat has an electrical system, you might be able to wire the
fishfinder 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 fishfinder. You can also wire the fishfinder directly
to the battery.
CAUtION: The Fishfinder 400C maximum input voltage is 35
Volts DC. Do not exceed this voltage, because this can damage
the Fishfinder 400C and void the warranty.
NOtE: During a typical installation, use only the Red and Black
wires. The other wires do not have to be connected for normal
operation of the Fishfinder 400C unit. For information on connecting
to a NMEA or CANet compatible device, see
0
page 11) indicates the appropriate
page 12.
To install the wiring harness:
1. Use a test light or voltmeter to determine the polarity of the
voltage source.
2. Connect the Red (+ or positive) wire to the positive voltage
terminal. (If you use the boat's fuse block, route the positive
connection through the fuse, as shown on the diagram.)
3. Connect the Black (- or ground) wire to the negative voltage
terminal.
4. Install or check the 3-Amp fuse (on the boat's fuse block or in
the in-line holder).
5. Align the notches on the cable plug and on the back of the
fishfinder. Insert the cable into the connector, and turn the
lock ring counter-clockwise until it stops.
-Amp
fuse
Boat ground
—
+
To Fishfinder 400C
Fuse block
To 0- Volt boat supply
2A
Fishfinder 400C Owner's Manual