The background of this research is about automotive technology development and lead to the electrical system that require appropriate power and aimed that at knowing how to design, performance and spesification of capacitor bank it will be designed. The research process in making is start in gather the standard electrical data in Isuzu Panther diesel new royal 25 in 2000 that became as reference to establish the size capacitor bank. Than continue with combine the tool and the material, the last method of testing the bank capacitor with osiloscop, is function and can save the capasity and stabilize the voltage. After done creating and tested with bank capacitor can activate some elecrtical component at Isuzu Panther Diesel New royal 25 year 2000 without using battery and can be concluded the design result is able to purify and stabilize the flow DC from 15,2V to 12V, able to save the capacity until 3,2kJ and able to flow current 5,2 A during 26 second.