Garmin GT17M-THF Galvanic Isolator Kit

The Garmin GT17M-THF Galvanic Isolator Kit is an essential component for any serious boater running modern electronics. If you've spent years on the water, you know that stray electrical currents can silently corrode through-hull fittings, propellers, and sacrificial anodes—sometimes before you even notice the damage. This isolator kit works quietly in the background to break the galvanic circuit between your vessel's AC and DC electrical systems, protecting your metal hardware from corrosion damage that can cost thousands in repairs or replacement.

The GT17M-THF isolator uses transformer-coupled isolation technology to eliminate the path through which dissimilar metals aboard your boat set up a corrosive galvanic cell. By isolating the neutral and ground connections between your ship's power distribution and shore power (or generator systems), this kit prevents the flow of stray currents that accelerate corrosion on aluminum and zinc components. The compact, lightweight design—just 1 pound—installs cleanly in the electrical cabinet without consuming valuable space, making it ideal for retrofit installations on existing vessels or new builds alike.

Boaters with larger vessels, multiple through-hull fittings, or those who keep their boat in saltwater environments benefit most from this protection. The Garmin GT17M-THF integrates seamlessly with Garmin marine electronics systems and standard shore power pedestals, making installation straightforward for any competent marine electrician. If your boat is equipped with a modern AC distribution panel and you're looking to extend the service life of your underwater metals, this galvanic isolator kit is a worthwhile investment in long-term vessel preservation.