A method is provided for controlling electrical components in a vehicle including multiple traction voltage systems, wherein each traction voltage system includes at least one electrical component, and which electrical component has the same function in each traction voltage system, the method involving the steps of monitoring and registering the state of health of each electrical component over time; predicting a predetermined parameter for each electrical component, which parameter is related to a future operating state inhibiting the use of the components; determining a control strategy for each electrical component based on the state of health of the electrical components to balance the parameters towards a common value; and controlling the electrical components based on the determined control strategy.