The 12 Volt Doctors Project Book goes beyond basic equipment. It covers projects you might find nice to have, but are not available for purchase. All of the projects are intended for use with 12 volt systems, or are somehow related to 12 volt battery systems and direct current. Previous experience with electrical and mechanical work is suggested. This book offers you a variety of building projects with just the circuits, components, and brief descriptions of how they work. Some of the projects in this book include: Adding a third battery bank without another main switch. Making an ammeter for high current. High and low voltage indicator lights. Various alarm systems. Wind speed indicators. Motion sensors.