how to mount a fishfinder on an aluminum boat

3 min read 05-02-2025

how to mount a fishfinder on an aluminum boat

Finding the perfect spot to mount your fish finder on an aluminum boat can be tricky. Aluminum boats, with their thinner hulls and often-complex ribbing, require a slightly different approach than fiberglass boats. This comprehensive guide will walk you through the process, ensuring a secure and effective installation.

Choosing the Right Location for Your Fish Finder

The ideal location for your fish finder transducer depends on several factors. Consider these points before you even start drilling:

Factors Affecting Transducer Placement

Hull Type: Aluminum boats vary significantly in their hull design. Some have a smooth bottom, while others have pronounced ribs or a stepped hull. The transducer needs a smooth, consistent contact area for optimal performance.
Desired Functionality: Do you need to see shallow water details? A transom mount might be best. Planning on trolling at higher speeds? Consider a thru-hull or a dedicated trolling motor mount.
Accessibility: Will you need easy access to the transducer for cleaning or maintenance? Choose a location that allows for this.
Interference: Avoid mounting near other metal components on the boat, such as the motor or battery, which could interfere with the signal.

Best Mounting Locations

Transom Mount: A popular choice, especially for smaller boats. It's easy to install and access. However, it might be affected by air bubbles at high speeds.
Thru-Hull Mount: Provides the clearest signal, especially in shallow water, but requires drilling a hole through the hull. This is a more permanent solution.
Trolling Motor Mount: Ideal for trolling, offering a clean installation and minimal interference. But it only works if you have a trolling motor.

Preparing Your Aluminum Boat for Installation

Before you begin, gathering the right tools and materials is crucial:

Necessary Tools and Materials

Fish Finder: Your chosen fish finder unit and transducer.
Drill: With appropriate drill bits for the mounting hardware.
Measuring Tape: To accurately measure and mark the location.
Pencil or Marker: To mark the drilling locations.
Level: To ensure the transducer is mounted straight.
Silicone Sealant: To waterproof the mounting area (especially crucial for aluminum).
Appropriate Mounting Hardware: The manufacturer's recommended hardware for your specific transducer.
Wrench or Socket Set: To tighten the mounting bolts securely.
Safety Glasses and Gloves: Always prioritize safety.

Mounting Your Fish Finder: A Step-by-Step Guide

Here's a detailed process for mounting your fish finder, regardless of the chosen method:

Step 1: Selecting and Preparing the Mounting Location

Carefully choose the mounting location based on the factors discussed earlier. Clean the surface thoroughly with a degreaser to ensure proper adhesion.

Step 2: Marking the Drilling Locations

Using the transducer's mounting bracket as a template, mark the drilling locations with a pencil or marker. Double-check your markings before drilling.

Step 3: Drilling the Holes (If Necessary)

If using a thru-hull or trolling motor mount, carefully drill the holes using the appropriate drill bit. Go slow to prevent damage to the aluminum.

Step 4: Applying Silicone Sealant

Generously apply silicone sealant to the mounting surface and around any holes. This prevents water leakage and corrosion.

Step 5: Mounting the Transducer

Securely attach the transducer to the mounting bracket, following the manufacturer's instructions. Use the level to ensure it's mounted straight.

Step 6: Connecting the Wires

Carefully connect the transducer wires to the fish finder head unit, following the wiring diagram provided.

Step 7: Testing the Installation

Turn on the fish finder and test the installation. Check for any interference or issues with the signal.

Maintaining Your Fish Finder Mount

Regular maintenance is essential for a long-lasting and effective installation:

Clean the Transducer: Regularly clean the transducer with fresh water to remove any algae or debris.
Inspect the Sealant: Periodically inspect the sealant for any cracks or damage. Reapply as needed.
Tighten Bolts: Check and tighten the mounting bolts periodically to ensure a secure mount.

By following these steps, you'll successfully mount your fish finder on your aluminum boat, providing years of reliable performance on the water. Remember to always consult your fish finder's manual for specific instructions and recommendations.