Overview

The Garmin 010-13348-10 is a galvanic isolator kit for the GT17M-THF transducer. It replaces the galvanic isolation parts included with the transducer so the thru-hull installation keeps the intended electrical isolation between the transducer assembly and surrounding metals.

The GT17M-THF is a flush-mounted 1 kW midband CHIRP transducer (80-165 kHz). If the isolation parts were damaged during a haul-out, compressed over time, or went missing during service, this kit restores the installation back to the correct stack-up.

Key features

• Replacement galvanic isolation parts for GT17M-THF transducer installations
• Helps reduce galvanic activity around a thru-hull by keeping dissimilar metals from being directly connected through the mounting stack
• Useful for service work when the original isolating hardware is worn, cracked, or missing
• Applies to GT17M-THF systems commonly used as 1 kW midband CHIRP (80-165 kHz) flush-mounted thru-hull transducers
• Targeted maintenance part that lets you keep the existing transducer in place

Compatibility and fit

Compatibility is specific to the GT17M-THF transducer. Confirm the model on your transducer label before ordering, especially if the boat has more than one sonar channel or mixed transducer types.

This kit is for the isolation hardware only. It does not change the transducer tilt option, connector style, or cable routing.

Installation and service notes

Replace the isolator parts while the boat is out of the water or when the transducer is already being removed for inspection. Take note of the existing hardware order so the isolation components go back in the same positions.

After reassembly, check that the transducer and surrounding underwater metals are not unintentionally bonded together through the mounting hardware. Keeping that separation intact matters most on boats that live in saltwater or spend long stretches connected to shore power.

Use cases on board

This kit is a good match for anglers and cruisers running a GT17M-THF thru-hull who want the isolation hardware in the mounting stack kept in working condition over time, particularly on boats stored in marinas with mixed underwater metals.

If you are chasing intermittent sonar noise or seeing signs of corrosion around the installation, restoring the isolation parts is a sensible place to start after confirming the rest of the bonding and DC grounds are in good shape.