Humminbird NS25 Operation Manual page 27

If your boat has an electrical system, there is probably a fuse panel in the console area, which
can be used to attach the NS25 power cable. If a fuse terminal is available, use crimp-on type
electrical connectors (not included) which match the terminal on the fuse panel. Attach the black
wire to ground, and the red wire to 12 VDC power. Be sure to use a 1.5-amp fuse in the
connection. A 6 foot long power cable is included. You may shorten or lengthen the cable using
18 gauge multi-strand copper wire.
CAUTION: Some boats have 24 or 36-volt electric systems. Be sure your NS25 is connected to a
12 VDC power supply. If you must wire the NS25 directly to a battery, be sure to use the in-line
fuse holder and 1.5-amp fuse provided for the protection of the unit. Hummingbird is not
responsible for over-voltage or over-current failures.
To minimize the potential for interference with other marine electronics, particularly VHF radios,
route the transducer cable and the antenna cable as far apart as possible. A separate power
source may be necessary to eliminate interference.
Before installation, gather the parts needed: control head, mounting bracket, connector holder,
power cable, and mounting hardware.
There are two different ways to route the cables to the unit: through a hold in the mounting
surface underneath the mounting bracket, or from a hold outside the mounting bracket. It is
preferable to route the cables from underneath the bracket for maximum weather protection;
however, access to this area may not be possible.
If the cables must pass through the mounting surface at a point not covered by the mounting
bracket, a hole cover is supplied to provide maximum protection for this opening.
Consider also that the mounting surface should be adequately supported to protect the control
head from excessive wave shock and vibration, and provide visibility while in operation.
The mounting area should allow sufficient room for the unit to pivot and swivel freely, easy
removal and installation.