My lovely narrow boat is now 14 years old and I need to have a look at the electrics. She is currently fitted with a single isolator (of the on/off lever type), a single alternator (on a Perkins MC42), a single starter battery, and 2 leisure batteries. The isolator has just given up (requiring a bit of local hotwiring!), and I need to replace that. However, things have obviously moved on a lot since she was built and I wonder if I ought to bring things up to date a bit. Magazines are full of wonderful looking things to protect the batteries, complete with lots of lights and dials, all at a suitable price, but I wonder what you would all recommend at this stage of the planning. The boat is only used for holidays and the like, and will shortly be kept in a marina where there is access to shore power, although the boat currently does not have a hook up (which I would like!). All advice welcomed!