Furuno BBDS1 Operator's Manual page 21

Cable routing
Route the sensor cable over the transom, through a drain hole, or through a new hole drilled in
the transom above the waterline.
Never cut the cable or remote the connector; this will void the warranty. Always wear safety gog-
gles and a dust mask.
1. If a hole must be drilled, choose a location well above the waterline. Check for obstructions
such as trim tabs, pumps, or wiring inside the hull. Mark the location with a pencil. Drill a hole
through the transom using a 19 mm or 3/4" bit (to accommodate the connector).
2. Route the cable over or through the transom.
3. On the outside of the hull secure the cable against the transom using the cable clamps. Posi-
tion a cable clamp 50 mm (2.0") above the bracket and mark the mounting hole with a pencil.
4. Position the second cable clamp halfway between the first clamp and the cable hole. Mark this
mounting hole.
5. If a hole has been drilled in the transom, open the appropriate slot in the transom cable cover.
Position the cover over the cable where it enters the hull. Mark the two mounting holes.
6. At each of the marked locations, use a 3 mm or 1/8" bit to drill a hole 10 mm (0.4") deep. To
prevent drilling too deeply, wrap masking tape around the bit 10 mm (0.4") from the point.
7. Apply marine sealant to the threads of the #6 x 1/2" self-tapping screw to prevent water from
seeping into the transom. If you have drilled a hole through the transom, apply marine sealant
to the space around the cable where it passes through the transom.
8. Position the two cable clamps and fasten them in place. If used, push the cable cover over the
cable and screw it in place.
9. Route the cable to the instrument being careful not to tear the cable jacket when passing it
though the bulkhead(s) and other parts of the boat. To reduce electrical interference, separate
the sensor cable from other electrical wiring and "noise" sources. Coil any excess cable and
secure it in place with zip-ties to prevent damage.
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1. MOUNTING