Wiring Harness Installation

The Fishfinder 240 comes with a wiring harness that connects the unit to power and the transducer with one easy-to-remove connection. Make sure the wiring harness will reach the unit before beginning installation.

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 the transducer lead is too short, DO NOT cut the transducer lead to lengthen the cable. This will void the warranty. Transducer extension cables are available in 10’ or 20’ lengths from your GARMIN dealer.

Wiring to a Fuse Block

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.

Installing the Wiring Harness:

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.

During a typical installation, only the Red and Black wires are used. The Blue wire supplies NMEA data, and doesn’t have to be connected for normal operation of the unit. The Yellow (alarm) wire is not used, the Fishfinder 240 does not support external alarms.

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Installation

Installing the Wiring Harness

10-18 Volt Boat Supply

+

Install 2-Amp Fuse

2A

-

Boat Ground

WireBlack

WireRed

Fishfinder 240

5