Solar panels on deck and...
...submersible hydrogenerators produce energy on board.
Batteries apparently in good order
Accumulation at the poles - high time for new batteries
Removing the defective battery...
...possibly install new charging cables...
...and there will be light!
Constant exposure to salt water...
...are a challenge for navigation lights,...
...often leading to a need for renewal!
Corroded connections require regular cleaning
A multimeter helps detecting troublespots.
Engine compartment on a Hallberg-Rassy.
The electric starter of an outboard engine.
Corroded earth strap on a magnetic switch.
Navigation instruments on a motorboat...
...and at the helm station of a sailing yacht.