Humminbird 531871-1-A User Manual

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Unit Switch

Thank You

Thank you for choosing Humminbird®, America's #1 name in fishfinders. Humminbird® has built its reputation by

esigning and manufacturing top-quality, thoroughly reliable marine equipment. Genuine Humminbird® accessories

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offer the opportunity to upgrade and expand the capabilities of your Humminbird® product.

Your Humminbird® is designed for trouble-free use in even the harshest marine environment. In the unlikely event that
your Humminbird® does require repairs, we offer an exclusive Service Policy - free of charge during the first year after
purchase, and available at a reasonable rate after the one-year period. For complete details, see the Warranty section
included in this manual.

Contact our Customer Resource Center at 1-800-633-1468 or visit our Web site at humminbird.com.

Installation Overview

Following are instructions for the installation of this accessory. Before you start installation, we encourage you to read
these instructions carefully in order to get the full benefit from your Humminbird® accessory. If you find that any items
are missing from your installation kit, call our Customer Resource Center at 1-800-633-1468 or visit our Web site at
humminbird.com.

The Unit Switch comes with all the necessary hardware to allow you to connect your two control heads to one
transducer. The switch is intended for installation on the console, and will work well on almost any boat.

531871-1_A

Unit Switch

NOTE: The Unit Switch will not allow the six beam-3D transducer to be shared.

Supplies: In addition to the hardware supplied with your Unit Switch, you will need a hand drill with various size bits,
a Phillips screwdriver, an adjustable wrench, and a 3 amp fuse.

700 SERIES™ NOTE: If you are installing the Speed Sensor accessory (optional), you will also need to purchase the
Sonar/Speed Y-Cable. Contact our Customer Resource Center for details at 1-800-633-1468 or visit our Web site at

humminbird.com.

Installation

Before installing the Unit Switch, gather all the parts you will need, and make sure that the planned location of the
Unit Switch will allow you to connect the two control heads to your transducer. Perform the procedures in the
following sections to install the Unit Switch on your boat.

1. Locating the Unit Switch Mounting Position

There are two ways to find the mounting location, as follows:

Switch Panel: If your console already contains a switch panel with an available slot, slide the Unit Switch into the
slot until it snaps into place. Then skip ahead to procedure two.

In-Dash: If your console does not have a switch panel or a pre-made mounting location, you will need to create
one yourself.

Mounting the Switch

Switch

Boat Console

© 2011 Humminbird®, Eufaula AL, USA.

All rights reserved.

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Unit Switch

o manually create a mounting location

T

. Locate a suitable, flat area of the dash to mount the Unit Switch. The switch requires a depth of at least 1.5 inches

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(38.1 millimeters). Make sure that it will be positioned within 5 feet of one control head and within 20 feet of the
other control head, and that the transducer cable will reach to the planned location of the Unit Switch. Also, make
sure you have access behind the panel in order to attach the cables.

2. Tape the template (included) over the desired in-dash mounting location.

3. At a location inside the dotted line on the template, drill a hole large enough to insert the blade of the
reciprocating saw. Carefully begin cutting toward the dotted line, then follow the dotted line around the
template. Remove the template when finished.

4. Insert the end of the switch through the hole until it snaps securely in place.

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2. Connecting the Control Heads to the Switch and the Transducer

If your control head is already installed, you may have to remove the control head from the Quick Disconnect
Mounting Bracket and temporarily disassemble the connector holder.

NOTE: Your connector holder hardware may be different than the illustration, depending on your Humminbird® model. See
your control head installation guide for details.

531871-1_A

nserting the Cable Connector

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CAUTION! Do not cut or shorten the transducer cable, and try not to damage the cable insulation. Route the cable as far as
possible from any VHF radio antenna cables or tachometer cables to reduce the possibility of interference. If the cable is too
short, extension cables are available to extend the transducer cable up to a total of 50 feet. For assistance, contact the
Customer Resource Center at humminbird.com or call 1-800-633-1468 for more information.

To connect the transducer to the Unit Switch:

1. Access your Transducer cable and insert the Transducer cable connector into the Unit Switch connector until you
hear it click into place. Refer to the Connecting the Control Heads to the Switch and the Transducer
illustration on the following page for guidance.

To connect the control heads to the Unit Switch:

1. Insert the cable connectors from the Unit Switch through the T2 slots (transducer slots) on the connector holders.
Then reattach the connector holders, if necessary.

CAUTION: The slot for the connector is keyed to prevent reversed installation, so do not force the connector into the holder.
See your control head installation guide for additional information.

700 SERIES™ NOTE: If you are installing the Speed Sensor accessory (optional), insert the Sonar/Speed Y-Cable connector
into the T2 slot on the connector holder. Then, connect the transducer connector and speed sensor connector to the
corresponding connectors on the Y-Cable. The Y-Cable requires a separate purchase. Contact our Customer Resource Center
for details at 1-800-633-1468 or visit our Web site at humminbird.com.

Connector Holder

Unit Switch
Cable Connector

© 2011 Humminbird®, Eufaula AL, USA.

All rights reserved.