By Boat Battery editorial team · 2 minute read · Editorial policy
Look for moisture, corrosion, damaged insulation, loose restraints and signs of heat without disturbing live connections. Have suspect high-current wiring assessed before continuing normal use.
Inspect corrosion and moisture paths
Build a visual inspection into the boat’s normal checks. Use good lighting and compare with photographs from commissioning. Look for changed cable positions, worn insulation, cracked covers or moisture trails. Salt deposits and corrosion can indicate a leak or persistent exposure that needs solving, not simply wiping away.
Identify signs of connection heating
A discoloured lug, softened cover or unusual smell can point to heating. Stop and arrange an appropriate assessment rather than tightening a live terminal as an experiment. Jewellery and metal tools around an energised bank can create a short circuit. Safe isolation and repair procedures depend on the whole installation, including charging sources and other batteries.
Check cable support and covers
Check the mechanical surroundings as well as the electrical parts. Stored equipment should not press against cables, block required airflow or prevent access to an isolator. Battery restraints should remain in place, and protective covers should still fit after other maintenance aboard. A small plumbing job nearby can introduce a new leak path into a previously dry compartment.
Record faults and completed repairs
Keep a dated record of concerns and repairs. Follow the equipment maker’s maintenance instructions for any torque checks or approved protective treatment; more force and more coating are not automatically better. If the cause was water entry, verify that the leak has been addressed before considering the job complete. Replace the baseline photographs after an approved change.
A visual check without touching live terminals
- Water trails, salt deposits or corrosion
- Insulation wear and displaced covers
- Discolouration or other evidence of heat
- Secure restraints and clear access
- Changes since the commissioning photographs
Frequently asked questions
Should I tighten a warm terminal myself?
Do not work on a live high-current connection. Stop using the affected system as appropriate and arrange safe isolation and assessment by a qualified person.
Related installation planning resources
Use these notes to prepare your own measurements and questions. Check the exact equipment manuals and have the proposed system assessed for your vessel before buying or changing electrical components.
Calculate your boat battery capacity
The house bank calculator takes your loads, your nights on the hook, your solar and your alternator, and returns the bank, the DC-DC charger, the AGM equivalent and the weight you take off the boat.
Open the calculator