Why a short check before departure is useful
Most electrical problems do not appear suddenly. They develop: a battery takes longer to charge, a light flickers, a connection gets warm, or a piece of equipment resets under load. Those small changes are easy to notice at the berth and much harder to manage at anchor or underway.
A pre-departure check is not a full inspection. It is a short routine that confirms the systems you rely on are behaving as expected before the boat leaves the dock. It also records what has changed since the last trip.
The check should take only a few minutes once it becomes routine. The value is in doing it consistently and noting changes rather than waiting for an obvious failure.
Batteries and charging
Start with the battery state and charging sources. Check the battery voltage or monitor reading before charging, then confirm the charger or alternator is bringing the voltage up as expected. If a battery monitor is fitted, note the state of charge and whether the reading is consistent with the last trip.
Look for signs of charge not keeping up: a charger that runs longer than usual, an alternator that only charges at higher revs, or a battery that falls away quickly once the load is applied. If something has changed, record it before departure rather than assuming it will recover.
Check that the battery terminals and visible connections are secure and free from corrosion. A connection that has worked loose in the last trip is easier to spot now than in poor weather.
- Battery voltage or monitor reading before charging.
- Charging source working as expected.
- Any change in charging time or behaviour.
- Terminals and visible connections secure.
Lighting and essential loads
Switch on the navigation lights, deck lights and interior lights that matter for the trip. Check for flickering, dimming or lights that do not come on. A flickering light can be a fitting problem, a connection problem or a sign of voltage drop.
Run the equipment that will be used while away: fridge, autopilot, pumps, winches and electronics. Listen for changes in pump or winch sound and watch for equipment that resets when another load starts. These are often early signs of a supply problem.
If the vessel has a windlass, test it without load if conditions allow. Note whether it runs smoothly and in both directions. Do not force a winch that is stalled or tripping a breaker.
Electronics and communications
Check that the VHF powers up, receives and transmits. If possible, confirm with another station or a handheld radio rather than relying on a local check. Check the navigation equipment, chartplotter and any communications equipment that will be used on the trip.
Record any equipment that behaves differently from the last trip: a radio that is noisier, a display that dims when transmitting, or a chartplotter that resets. These changes are easier to assess before the boat is away from support.
If a fault appears only when the engine is running or when another system is switched on, note the trigger. That detail is often more useful than the equipment name alone.
Record changes, not just failures
The most useful part of a pre-departure check is the record of what has changed. A new noise, a slower winch, a light that flickers or a charger that behaves differently is information, even if the system still works.
If something has changed and you are not sure whether it matters, include it in the notes and raise it with Maritime Electrical. A small change that is understood early is usually easier to resolve than the same change after it has caused a failure away from the berth.
When to arrange a scheduled inspection
Arrange a scheduled inspection if the check reveals a fault, if a system is intermittent, or if you are not confident the charging or electrical system will support the trip. Do not treat the pre-departure check as a substitute for proper maintenance.
Include what you noticed, when it started and what else was happening at the time. That gives the conversation a practical starting point and helps focus the inspection on the right system.