This seminar is meant to assist the boat-owner identify the most common sources of onboard electrical problems found on cruising vessels. Expedient diagnostic procedure and possible solutions will be discussed, with a focus on the use of a digital multi-meter and test leads. Other areas to be covered are Battery Charging Systems, Charging Devices, Electrical Circuit Testing, and Ground Faults. While DC circuits are the highest priority and will be given most focus, AC circuits will be discussed with common faults and troubleshooting techniques.