Most heavy-duty vehicles including trucks, tractors, buses, ambulances, refrigerated trailers, passenger vehicles, electric vehicles and boats have high amp Direct Current systems. Unlike the majority of components and systems in such vehicles, DC electrical systems have undergone very few major improvements in recent years. The Intelligent Power Management System discussed in this paper can offer significant improvements in the DC power management of such vehicles. The primary benefits of this system include: improved reliability of all electrical components, early warning of impending failures, extended service life, optimized generation, storage and use of power, and reduced maintenance cost and vehicle downtime. This paper will describe the Intelligent Power Management System, its design, applications and benefits.