Installing The Transducer Cable; Thru-Hull And Transom-Mount Installation - Raymarine L750 Operating Handbook

Chapter 2: Installation

Installing the Transducer Cable -

Thru-Hull and Transom-Mount Installation

A 20 foot length of cable, with the connector attached, is supplied with
the transducer. During the installation, do not cut the transducer
cable or remove the connector. Do not try to shorten or splice the
cable. The transducer cable includes several wires, along with
shielding and insulation. If the cable is cut, it cannot be repaired.
(Cutting the cable will also void the warranty.) During installation, if you
need to drill any holes for the cable, they must be large enough to accept
the connector. This will allow you to make the installation without cutting
the wire.
1. For a transom-mount installation – Route the cable up and over
the top edge of the transom. See Fig. 2-15. Secure the cable using
cable clamps. (These clamps are available from your local marine
equipment supplier.)
If you do not want to expose the cable on the deck, you may drill a
new hole (3/4" or 19 mm) through the transom for the cable.
(Remember – this hole must be large enough to accept the cable
with the connector attached. Do not cut the cable!) To seal the
opening, use a feed-thru cap where the cable passes through the
transom.
2. For either type of installation – Run the cable through the interior
of the boat. Follow the suggestions in the section on "EMC
Installation Guidelines."
3. Be careful not to tear the cable jacket when passing it through
bulkheads and other parts of your boat. Secure the cables in place
using tywraps or lacing twine. Coil the extra cable and tie it out of the
way.
4. If the 20 foot transducer cable is not long enough, a 15 foot extension
cable (5M) is available from your Raymarine dealer (part no. M99-
139). When you attach the extension cable, be sure that the
connections are tight and watertight. Use Dow Corning DC-4 or an
equivalent sealing compound to protect the connector assemblies.
5. At the rear of the display unit, the transducer cable plugs into a short
section of wire called a "pigtail." Plug the transducer cable into the
pigtail, then plug the pigtail into the rear of the display unit. If you
need to disconnect the transducer cable, try to do this at the pigtail
rather than the rear of the display unit.
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