Patent ID: 8519563

Claim:
An electrical system for a motor vehicle, the electrical system comprising: a consumer battery set comprising one or more consumer batteries for supplying electric current to various electrical consumers of the motor vehicle, a starting battery set comprising one or more starting batteries and connected in parallel with the consumer battery set, a starter motor for starting the engine, a battery isolator in an electrical circuit with the starting battery set, the isolator being switchable between an off position thereof in which the battery isolator is configured to keep the starting battery set electrically disconnected from the starter motor, and an on position thereof in which the battery isolator is configured to keep the starting battery set electrically connected to the starter motor for supply of electrical current to the starter motor from the starting battery set, and a starter operable for generating a starting signal for starting the starter motor, an electronic control device configured and operable such that upon receiving a starting signal from the starter, the control device causes the battery isolator to assume the on position, and thereafter the control device causes the starter motor to start so that the battery isolator is in the on position before the starter motor is started, and the control device is configured and operable for switching off the starter motor and to thereafter allow the battery isolator to be switched from on position to off position so that the starter motor is switched off before the battery isolator is caused to assume the off position.