Furuno GP-1670F Operator's Manual page 160

13. INSTALLATION
1. If a hole must be drilled, choose a location well above the waterline. Check for ob-
structions 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 accom-
modate 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. Position a cable clamp 50 mm (2") 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 (3/
8") deep. The prevent drilling too deeply, wrap masking tape around the bit 10 mm
(3/8") 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 tran-
som, 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 display unit 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 dam-
age.
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