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Fishfinder 300C Installation Instructions
Compare the contents of this package with the packing list on the box. If any pieces are missing, contact your Garmin dealer immediately.
Before you begin the installation:
• Read and follow the instructions to install the Fishfinder 300C.
• Gather the appropriate fasteners and tools.
• Verify that all cables can reach the Fishfinder 300C mounting location and the transducer.
• Wear safety goggles and a dust mask when drilling, cutting, or sanding.
If
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Use the following table to determine the drill bit size: Material Material Thickness (in.) Material Thickness (mm) Hole Size (in.) Hole Size (mm) Hole Size (Drill Number) Aluminum alloy from 1/32 to 5/64 from 0.76 to 2.03 .128 3.25 30 sheetmetal from 3/32 to 3/8 from 2.28 to 9.52 .147 3.73 26 Fiberglass - all thicknesses .140 3.56 28 High Density Plastic - all thicknesses .125 3.17 1/8 Plywood (resin impregnated)—Professional installation recommended .144 3.66 27 Drill Size Table To mount t
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8. If the top and bottom mounting covers are attached to the front of the Fishfinder 300C, remove them by unsnapping the covers from the sides. 9. Place the Fishfinder 300C into the cutout. Mounting covers 10. Securely tighten the four mounting screws through the Fishfinder 300C into the drilled mounting holes. NOTE: Stainless-steel screws may bind when screwed into fiberglass and overtightened. Garmin recommends applying an anti-galling stainless anti- seize lubricant to the screw before u
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Mounting the Transducer on a Trolling Motor To mount the transducer on a trolling motor: 1. Slide the large cable tie through the slot on the transducer mount, with the ridges of the cable tie facing up, until equal lengths of cable tie extend on both sides of the mount. NOTE: For cold water, or heavy timber or debris areas, a metal 4–5" (100–130 mm) worm-gear clamp is recommended. 2. Position the mount gasket on the curved top of the transducer mount. 3. Place the transducer assembly ag
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Mount the transducer Apply marine sealant to all screw cable cover well above threads to prevent water from the waterline. seeping into the transom. Transducer should extend 1/8" (3.2 mm) below a fiberglass hull or 3/8" (9.5 mm) below an aluminum hull. Ensure that the transducer is below water level when the boat is on plane at high speed. Do not mount the transducer directly in the path of the Mount the transducer parallel propeller. The transducer can cause cavitation that may with
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+ Step 4: Install the Wiring Harness The Fishfinder 300C comes with a cable assembly that connects it to power and to the transducer with one connection and provides interface capabilities for connecting external devices. The color code in the diagram on page 7 indicates the appropriate harness connections. The replacement fuse is an AGC/3AG 3A fuse. If it is necessary to extend the power wires, use 22 AWG wire. Do not cut the transducer cable. Cutting the transducer cable voids your warranty.
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To transducer (Red) + Vdc (Black) Ground dc power source (Blue) NMEA 0183 OUT RXD + NMEA device (optional) RXD - Alarm relay (optional) 100 ma maximum coil current (Yellow) Alarm Low Fishfinder 300C Wiring Diagram Connecting to a NMEA device You can connect the Fishfinder 300C to additional NMEA 0183-compatible electronic equipment, such as a Garmin GPS (Global Positioning System) device. If equipped with a capable transducer, the Fishfinder 300C can send depth, temperature, and speed informat
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Step 5: Test the Installation NOTE: Although it is possible to perform some checks with the boat on a trailer, the boat should be in the water to properly test the installation. Press and hold the POWER key until the Fishfinder 300C beeps. Use ROCKER and SELECT to highlight and select menu items on the Fishfinder 300C. The first time you turn your Fishfinder 300C on, you must configure a series of initial settings. To initialize your Fishfinder 300C settings: 1. Language—select the on-scree
