In recent year there are numerous developments ongoing in Electric Vehicle industries. Because of increasing fuel prices and pollution, there are many factors to be considered in a performance of an electric vehicles. One among them is safety factor. In an electric vehicle high voltage batteries were used for the motor operation. So there must be a proper isolation between its high voltage battery terminals and also battery pack with respective to chassis of the vehicle. But sometimes isolation failure occurs due to some fault conditions like Battery damage or crash of the vehicle. In that case, human handling that vehicle might get electrified. So in order to overcome this issue a control technique is proposed in this paper for the isolation measurement of battery terminals. It monitors proper isolation check at initial stage that is before starting the vehicle and also during the continuous working. This control strategy ensures the proper stability and allows decoupling the system avoiding that the disturbances affect the battery terminal isolation and operation of on-board charger.