Installing the Fishfinder 400C

Step 3: Install the Transducer

Proper transducer installation is key to getting the best performance from your fishfinder. If the transducer lead is too short, extension cables are available from your Garmin dealer. Coil and secure any excess cable.

CAUTION: DO NOT cut the transducer lead or any part of the transducer cable, because cutting the transducer cable voids your warranty. The cable cannot be spliced and connected to any existing (Garmin or non-Garmin) transducer cables.

The following pages contain tips and basic installation instructions for some popular transducers. Detailed installation instructions are provided in the transducer kits. Some transducers might have to be installed by a professional marine installer.

Assembling the Transducer

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1.Insert the rubber washer and plastic spacer into the transducer at the same time. DO NOT lubricate the rubber washer.

2.Route the cable toward the back of the transducer. Slide the transducer into the transducer mount.

3.Place a 5 mm flat washer on the 10-32 x 1.75" screw, and insert the screw through the transducer mount, spacer, and rubber washer.

4.Place the remaining 5 mm flat washer on the exposed end. Install the 10-32 lock nut finger tight. You can tighten the transducer further after installation on the boat.

Cable tie slot

Back of the transducer

Fishfinder 400C Owner’s Manual