Bonding System Failures on Older Boats: How to Spot Corrosion Problems Before They Sink You13/6/2026
 Broken bonding wire.
A recent service call took our ABYC Master Technicians aboard a boat where the owner was concerned about their bonding system. What we found is unfortunately very common on vessels 10, 15, or 20+ years old.
The bonding system had been properly installed years ago and was originally doing its job of protecting underwater metals from galvanic corrosion. However, many of the connections had been terminated with standard nylon connectors and no adhesive-lined heat shrink. Over time, saltwater migrated up the wire strands, causing severe corrosion, increased resistance, and eventual failure of the bonding circuit. This is a classic failure mode on older boats. The original installation met the standards of its time, but without proper sealing and maintenance, the system degrades. How to Test Your Bonding System. ABYC E-11 recommends that the DC bonding system maintain low resistance to provide an effective path for galvanic currents. A simple and effective field test is:
Readings significantly above 1.0 ohm usually indicate corroded connections, undersized wire, or broken conductors. This test is quick, requires only long test leads, and should be part of any annual inspection. For a more complete picture, technicians use a silver/silver chloride (Ag/AgCl) reference electrode. This tool measures the actual corrosion potential of the hull and underwater metals. According to industry best practices a properly protected boat typically shows hull potentials in a specific protective range depending on the build type of the vessel. Readings that are too positive can indicate insufficient anodic protection, while readings that are too negative may point to over-protection or stray current issues. Reference electrode testing is especially valuable when:
Warning Signs of a Failing Bonding System Many owners overlook early indicators until serious damage occurs:
By the time a bronze through-hull starts leaking or a propeller is significantly eroded, the repair cost is often much higher than preventive maintenance would have been. Corrosion is constant on any boat in saltwater. The most effective defense is a well-designed and properly maintained bonding system combined with regular testing. ABYC-aligned recommendations include:
Need Help Checking Your Boat? If you’re concerned about corrosion, anodes, or your bonding system — especially on an older vessel — don’t wait for a failure. The ABYC-certified technicians at Marine Craft can perform a thorough electrical and corrosion protection inspection using multimeters, reference electrodes, and ABYC standards. Call us today at 252-571-9980 to schedule an inspection. We’ll see you out on the water. Frequently Asked QuestionsHow often should I test my boat’s bonding system?ABYC recommends annual inspections of the bonding and cathodic protection system. A quick multimeter resistance test can be done by the owner, while a full reference electrode test is best performed by an ABYC-certified technician. What resistance reading should I see on a healthy bonding system?According to ABYC E-11 best practices, you should see 1.0 ohm or less between bonded underwater metals and the main DC negative bus when tested with a quality multimeter. Why do bonding wires corrode even if they were installed correctly?Over time, saltwater migrates into connections that are not properly sealed with adhesive-lined heat shrink. This is especially common on boats 10–20+ years old and leads to high resistance and eventual failure of the bonding circuit. What is a corrosion reference electrode and why is it useful?A silver/silver chloride reference electrode measures the actual corrosion potential of your hull and underwater metals. It helps determine whether your anodes are providing adequate protection, if you have stray current issues, or if your bonding system is functioning properly. Can I test my own bonding system or should I hire a professional?Basic multimeter resistance testing can be performed by a knowledgeable owner. However, reference electrode testing, interpretation of results, and repairs should be done by an ABYC-certified marine electrician to ensure accuracy and safety.
Posted by Dave C., ABYC Master Technician 13 June 2026
 Removing the top of a SeaRay 340.
One of the big struggles many marinas have is abandoned vessels and Marine Craft is no exception. Since we have owned Marine Craft we have had to take possession of six abandoned vessels. We were able to rehabilitate 2 for resale. Unfortunately 4 of the vessels were beyond the ability to repair. Those four vessels were safely removed from the water so their further deterioration would not pose a threat to the North Carolina waterways. As you can imagine, this is quite the undertaking for most marinas. In order to safely get the boat out of the water and keep from spilling fuel or other contaminates into the waterways a lot of work has to be put into getting abandoned vessels out of the water.
Abandoned and derelict vessels have become a significant and growing issue along North Carolina’s coast. From the Neuse River and Pamlico Sound to the Intracoastal Waterway, these neglected boats create safety hazards, environmental damage, and financial burdens for taxpayers and waterfront communities. According to the North Carolina Division of Coastal Management (part of DEQ), abandoned vessels pose serious risks including navigation hazards, leaking fuel and oil that contaminate waterways, and the release of other pollutants such as batteries and sewage. Once a vessel is left to deteriorate, it often becomes the responsibility of the state or local governments to remove — at significant taxpayer expense. Marine Craft is helping all of the North Carolina Tax Payers by taking care of abandoned vessels when we can. The True Cost of Abandoned Vessels: Removing an abandoned boat is rarely cheap. Costs vary widely depending on the size, location, and condition of the vessel:
What Can Be Done? While the state has programs to address abandoned vessels, removal is slow and expensive. Prevention is far more effective than cleanup. Boat owners should:
At Marine Craft NC, we specialize in marine construction, vessel handling, and environmentally responsible work in coastal waters. While we don’t typically perform large-scale abandoned vessel removal, we regularly assist with related marine construction projects, including seawall work, dock repairs, and site preparation in sensitive coastal environments. Marine Craft is part of the North Carolina Clean Marina program. While being a designated Clean Marina doesn't mean we are required to carry the costs of abandoned vessel removal we take stewardship of the environment seriously. We recently removed a 34' power boat from one of our slips that had been abandoned for 6 months. Unfortunately this owner was unable to properly care for or recycle his own vessel so it fell to us to take care of. We contacted the last owner and he gave us title and permission to remove his vessel from the water for recycling. We spent the next few days slowly dismantling the vessel to remove all of the fuel, water, batteries, engines, or other components that could potentially contaminate the waterways. Once those parts were removed we then hauled the vessel from the water and began to break it down for recycling where possible or disposal if necessary. All told, this process costs our business about $12,000.00 to remove this one abandoned vessel from the waterways. You can quickly see how this adds up over the many vessels we have taken care of. Marine Craft is more fortunate than some marinas in that we are building a full service boat yard. We have the machinery, infrastructure, skilled technicians, will, and care for the waterways to handle recycling the vessels safely. If you’re dealing with an aging vessel or need guidance on responsible marine construction and maintenance, our team is happy to help. We bring ABYC-certified expertise and years of local experience working on the Neuse River and Pamlico Sound. For official information on North Carolina’s abandoned vessel program, visit the NC Division of Coastal Management’s page on Abandoned and Derelict Vessels. If you have questions about marine construction, dock work, or vessel-related projects in Eastern North Carolina, feel free to contact us at 252-571-9980. The next time you are at a marina and see an abandoned vessel consider the arduous process to remove or repair the vessel. Always work to keep your own vessel in proper working order so it never needs to be abandoned and plan for those costs in your next boat purchase. One of the great things about the Antares Factory Certified Program is we have strict standards to keep all of our pre-owned Antares in ship shape. If we all work together responsibly we can keep the waterways clean, our boats enjoyable, and have fun on the water for years to come. Check out a short video of the team at Marine Craft taking care of one of the vessels here. We’ll see you out on the water. Frequently Asked QuestionsHow much does it cost to remove an abandoned boat in North Carolina?Removal costs typically range from $2,000 to $8,000 for small boats, but can exceed $15,000–$50,000 for larger or sunken vessels. These costs often fall on taxpayers when no owner can be found. Who is responsible for removing abandoned vessels in NC?In many cases, the North Carolina Division of Coastal Management steps in when vessels are truly abandoned. However, if an owner can be identified, they may be held financially responsible for removal and cleanup. Why are so many boats abandoned in North Carolina?Common reasons include high maintenance costs, storm damage, financial hardship, or owners passing away without a plan for the vessel. Once a boat becomes a liability, some owners simply walk away. Do abandoned vessels cause environmental damage?Yes. Leaking fuel, oil, batteries, and sewage from deteriorating vessels can pollute waterways and harm marine life. This is one of the main reasons the state prioritizes their removal. What should I do if I no longer want my boat?Contact a professional marine contractor or your local marina. Proper disposal or recycling is much less expensive than letting a vessel become abandoned and creating future environmental and legal problems. |
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