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5
To 10-35 Volt Boat Supply
2A
-
+
Boat Ground
Black Wire
Red Wire
Install 2-Amp
Fuse
To Fishfi nder 250/250C
Installation
Connecting the Power/Data Cable
The power/data cable connects the Fishfi nder 250/250C to a 10-35 volt DC system and provides
interface capabilities for connecting external devices. The color code in the diagram (pg. 6) indicates the
appropriate harness connections. If it is necessary to extend the power/data wires, use a wire of comparable
size and keep your extension as short as possible.
The unit can be wired directly to your boat’s battery or to an unused holder on your boat’s fuse block.
When connecting the unit directly to the battery, make sure the 2-Amp in-line fuse supplied with the unit is
installed . If needed, use an ACG/3AG - 2 Amp replacement fuse. If you decide to use the fuse block, remove
the in-line fuse holder supplied with the unit.
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 250/250C 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
250/250C can send depth, temperature, and speed information to the NMEA device. It can also mark a
location (pg. 15) that could be displayed on another device and can accept GPS navigational data (pg. 17),
such as position, time, course, distance, etc. Refer to the wiring diagram on the following page for interfac-
ing the Fishfi nder 250/250C with other devices.
Installing the Wiring Harness to a GPS or other NMEA device:
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/NMEA harness.
3. Connect the Brown (Data In) wire from the Fishfi nder to the Data OUT wire on the GPS/NMEA harness.
4. Set the Fishfi nder 250/250C NMEA Input/Output to ‘On’ (pg. 20). For Garmin GPS units, set the
communications interface to NMEA/NMEA, NMEA In/NMEA Out or NMEA.
Wiring and Interfacing
250C Manual.indd 5 1/27/2004, 3:54:56 PM