At home you can flick a switch and electricity will flow. A boat is more like an island. If electricity is used it must be replaced; if things go wrong you will have to fix them yourself. This book contains all you need to be a 12-volt troubleshooter. It provides some theory to help you understand basic practices of anticipating and preventing trouble. It shows you clearly how to locate a fault, correct the problem if you can or adopt a get-you-home remedy if you cannot. Read it at home, then keep it on your boat's bookshelf for when you need it most. Paperback. 96 pages.