In this paper, we proposed an intelligent interactive vehicle electrical power supply system for traditional fuel vehicles that was designed based on a smart vehicle electrical/electronic device system and is a fully distributed system with twin coordinators. In addition to the battery, generator and engine, all other electrical/electronic devices were integrated into this power supply system, including everything from simple lights to a complex control unit. Therefore, it can monitor every device’s status and protect it from power failure. In a vehicle’s electrical power supply network, the power supply for controllers and
communications is isolated from that for rough load consumption. Therefore, it can supply clean controller
power with no electromagnetic interference, creating a clean and safe electricity environment. The intelligent electrical power supply system monitors the power supply network regularly in real time and protects it from over current faults. Additionally, to achieve more accurate SoC estimations for a lead-acid battery in traditional fuel vehicles, a new algorithm style of a battery’s state of charge was established. Battery over discharge protection was achieved. Therefore, we believe the proposed system can reduce the probability of power failure in any complex situation and significantly enhance a vehicle’s electrical safety and stability