Installation In A Cored Fiberglass Hull - Raymarine Transducers User Manual

Chapter 2: Installation

Installation in a Cored Fiberglass Hull

12. Attach the connector nut to the cable per instructions in Trans-
ducer Cable Connections on page 39.
13. Attach the assembled connector cable to the transducer.
14. Route the other end of the cable to the fishfinder, being careful not
to tear the cable jacket when passing it through the bulkhead(s)
and other parts of the boat. To reduce electrical interference, sep-
arate the transducer cable from other electrical wiring and the
engine.
15. Coil any excess cable and secure it in place using tie-wraps to pre-
vent damage.
Note:
If you are using an extension cable, be sure to locate the mated
3-pin connectors well above the bilge waterline. To facilitate this, use
cable clamps on either side of the connection.
Installation in a cored hull is difficult. The objective is to bond the
sensor to the inside surface of the hull's outer skin while preventing
any moisture from penetrating the core.
CAUTION:
There is no way to determine if the outer skin is solid (no trapped
air bubbles in the fiberglass) at the selected location before
cutting the inner skin.
WARNING:
Always wear safety goggles and a dust mask.
1. Using a 4" (100 mm) hole saw, cut through the inner skin and the
core at the selected location (see Figure 2-18 ). The core material
can be very soft. Apply only light pressure to the hole saw after
cutting through the inner skin to avoid accidentally cutting the
outer hull.
2. Remove the plug of core material, so the inner core of the hull is
fully exposed. Sand the inside surface of the outer skin using a
miniature disc sander. Slightly undercut the surrounding coring if
possible.
3. Clean and dry both the inside surface of the outer skin and the
housing with a weak solvent, such as alcohol, to remove any dust,
grease or oil.
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