Abstract: For fuel economy, it is known that the engine of a motor vehicle may be turned off during vehicle operation while the electrical power for various appliances, such as the lighting circuit or the radio must be maintained. Upon restarting the engine, there may be a voltage drop in the vehicle supply circuit voltage with deteriorating effects in the lighting circuit and possibly failure of the radio. The disclosed circuit prevents such effects by limiting the rate of change of variations in vehicle supply circuit voltage as a function of connecting and disconnecting of a high-power component such as the starter.